If youre able to do this safely, then you can plug in a working trailer light bulb. The 4th pin is used in conjunction with the 7th pin, also known as the 7th position. In stock. Make sure the multimeter is set to measure resistance (ohms). It also has the Fluke brand name which assures you that it will be a long-lasting good multimeter (Check price on Amazon). Another way to diagnose a malfunctioning trailer is to remove the light bulb. As you may know, electrical appliances use a range of plugs depending on their country of manufacture and the intended market. This will complete the circuit and allow you to test for continuity. Your multimeter should indicate the value corresponding to the voltage of the battery you are using. Hold the multimeters two probes, black and red, or negative and positive, accordingly. Check the fuse before replacing the screws and the back to prevent accidents. Signal a turn or press the brakes or turn on your lights and connect the red probe of the voltmeter to the equivalent pin of the tow bar socket. Providing tool knowledge, appliance/device testing tips, and DIY project info in an easy-to read & non-intimidating style. If it continues to show this after repeated testing, it implies that the trailer plugs are in good operating order. Your email address will not be published. Next, check the ground pin of the plug against the positive pins. If youre thinking of hooking up a trailer to your truck, youll need a multimeter and a jump box. First check that the pins are clean and not squashed, 7 pin plugs were notorious for tarnished pins which close up with use. We would conclude this article with life-extending advice that immediately you find fault with your trailer lights, you should fix it quickly. All 7-pin trailer plugs are not the same, and you need to check that the plug that you are testing will fit your vehicle since you have to plug it into the vehicle and then test it. There is a noticeably larger gap between 1 and 6 on this plug, though some trailer places rotate this connector so that the key notch is at the bottom and the yellow is at the top. When wiring a trailer, you must pay attention to the voltage of the plug. If you still have any queries, ask down in the comment. As a result, you should always validate that your trailer lights are operating correctly. If your diagnoses reveal that you have a faulty wire or a burnout bulb, we recommend replacing them. Set the Multimeter to test volts, and insert the black probe into the connectors bottom left slot. Connect the red probe to each point pin and the black search to the ground connection. An example of data being processed may be a unique identifier stored in a cookie. (1). If none of these work, then there could be a problem with your trailer plugs and connectors. It is to ensure that it is receiving the requisite voltage. The circuit is damaged if the multimeter reads above the ideal reading. If you have confirmed the fault is not an inadequate grounding, next you have to test the trailer plug to be sure if it is receiving voltage. (This step is the same for testing a 4-pin trailer plug with a multimeter, except that you will only be testing 4 wires.). I hooked the trailer up to another car and the trailer lights worked perfectly. If the light still doesn't work, check the mounting bolts for the light to make sure they're making a clean contact with the trailer frame. After that, insert the red probe into the first light socket. The multimeter should show a reading of somewhere around 12 volts. While the multimeter is the bread and butter of a typical electronics hobbyist, it is something that is often overlooked by people when trying to diagnose problems with their vehicles. Having your trailer lights working well is crucial. Set your multimeter to read volt DC, and connect the black probe to the negative and the red probe to one of the control wires. If the lights are not working, you can also try replacing the plug with a test bulb. Trailer wiring combines the left turn/brake and right turn/brake signal for proper operation of the trailer lights. Trace the ground wire you want to test. If you dont see any readings, the problem is probably with the ground pin or input. Excellent help. Once the red probe displays 0.3 ohms, the socket is probably the issue. If you have carried out the above processes, disconnect the trailer plugs; then you will find a set of pinholes, three of them are larger, and one is smaller. Then, request your partner to turn on the brake light. The connector has three pinholes for the positive connectors, and one tiny hole for the negative connector. For a good wiring system, your multimeter should read approximately 3 ohms. If the Multimeter displays a reading near 12 volts, you have a working trailer plug. How to test 7 pin trailer plug with a multimeter? Connect the probes to confirm that they operate. We may receive a commission for purchases made through these links. Guy Presse 2.55K subscribers Subscribe 1.3K Share 310K views 11 years ago http://rv-mobile-services.ca/ The seven pin trailer plugs on travel. 3. The most common 7-pin trailer plug pinout has the following order: (1+) Black, (2+) Red, (3+) Yellow, (4+) Blue, (5+) White, (6+) Brown, (7-) Green. The good news is that they are available in a wide range of price ranges. One of the most complicated things to test on a car often seems to be the 7-pin trailer plug as it hosts 7 different electrical connections in one plug/wire.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'housetechlab_com-medrectangle-3','ezslot_3',120,'0','0'])};__ez_fad_position('div-gpt-ad-housetechlab_com-medrectangle-3-0'); But with the use of a simple multimeter with a black/red probe you can test this easily at home to determine if there is an electrical break within the plug. Next, you can check the voltage of the lights on the trailer. One of the easiest methods involves using a multimeter. Take your wire cutters and snip through all wires in the cord close to the plug.Now grab the box. Electrical engineering is my passion, and Ive been in the industry for over 20 years. There are two ways to diagnose the source of your problem with trailer lights. If it is working, then you can simply move the red probe to the next slot in the plug and test each of the brake lights, blinkers, and reverse lights until youve eliminated any of them as issues. The multimeter should read 0-.3 ohm resistance. Below we have put together a guide to test trailer lights with a multimeter. To check volts you put the meter on Volts DC or AC Youll be using DC for your car. Lives In: Denver Colorado Measure resistance in the ground terminal in the connector and grounding point in the vehicle. Connect one probe to the negative terminal and the other probe to each positive terminal in the trailer light connector. Turn your multimeter to the V symbol on a multimeter dial. Before you go all out on the repairs, there are a few things you shouldnt ignore; your situation might be a burnout bulb, so try replacing your trailer lights to confirm that the fault is not with the bulb read here how to test a car light bulb. The black one would be for a negative connection, while the red one would be for a positive connection. Other learning guides on multimeter are below. Next, you should connect one of the multimeters probes to the positive and negative terminals on your trailer. Youll need a black test lead to connect to the negative pin on the trailer, and a red one to the Ground pin on the vehicle. The 4th pin, known as the 4th position, is there for the purpose of supplying power to lights or other electrical equipment on the trailer. Higher current draws will expose these limitations. How do you make that happen? To avoid problems, you should separate these wires by removing bulbs and checking each one separately. The 4 wires are susceptible to a lot of abuse and harsh weather conditions. I CANNOT find the problem! A 7-pin plug (sometimes referred to as the "7-way trailer connector") is the connector and heavy-duty wire that brings the necessary power and related functions to the trailer you're towing. Testing for wiring problems might not be difficult, but the problem we face is how to begin; we have explained with detailed information how you can carry them out. How Do You Test A 7 Pin Trailer Plug With A Multimeter? It is also a very affordable multimeter which makes it easy to get for home use (Check price on Amazon). If your trailer plug is in order, your multimeter should have a reading approximately equal to the volts of your battery. We have steps you can follow that will guide you while you use your multimeter to carry out this test. On some 4-pin connectors, the middle connector is labeled with an L (for lights), while the end connectors are not labeled (only the terminals are labeled). To check the connector holes, you place your black probe on the negative pin and put your red probe into the other positive pinholes. Connect the multimeter leads to the multimeter. How to Ground a Cb Antenna on a Semi Truck? When the light is glowing, your trailer light connector should receive maximum voltage from the battery at that specific terminal. Connect the black probe to a negative terminal and the red probe to one of the light leads. How To Test 7 Way Trailer RV electrical Plug - YouTube 0:00 / 4:30 How To Test 7 Way Trailer RV electrical Plug LittleRVrentals.com 4.01K subscribers Subscribe 291K views 6 years ago How. References(1) color codes https://www.computerhope.com/htmcolor.htm(2) wiring system https://www.youtube.com/watch?v=ulL9VBjETpk. Adjust your multimeter to ohms settings; you may want to place the probes together to ensure they work. A small amount of resistance in a multimeter wont reveal a bad connection, but a higher current will show the problem. When you test the brake circuit pin on the 7-Way, it may be more beneficial to see how much voltage it is sending through. Usually ships within 3 to 4 days. Any suggestions? Do the same to the other set of pins, and then press the switch. The multimeter should detect about 0.3 ohms. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. When you connect the probes with the larger pins, your multimeter should not have a reading until you press the switch button, but when you attach them to the other two pins with lower current passing through them, your device should not have a reading when the button is pressed. Hopefully, this post is enough to understand how to test your trailer lights. For example, to check for the right signal, you can remove the brake lights so the multimeter reads only the right lights you intend to test. Take a look at some of our related articles below. Disconnect the 7-pin plug from your vehicle. To test your truck trailer plug, you'll need a multimeter. To test trailer brakes, set your multimeter to Ohms, place the negative probe on one of the brake magnet wires, and place the positive probe on the other magnet wire. Otherwise, you risk damaging the plug or your meter.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'handtoolsforfun_com-large-mobile-banner-1','ezslot_8',171,'0','0'])};__ez_fad_position('div-gpt-ad-handtoolsforfun_com-large-mobile-banner-1-0'); This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. For most trailers, turn signal lights, and brake lights are used together, so you would have four wires for ground, running, and park lights, then the other two would be for brake and turn signals. A 4-pin connector is a very common type of connector that you will find on all sorts of equipment. Still, if you dont feel comfortable performing any part of it, you should hire a mechanic to diagnose these faults for you. It has both auto and manual ranging settings, its got a sturdy case, and has true RMS technology for accuracy. Copyright 2023 MrFixItCa | ALL RIGHTS RESERVED. Part 1. This diagram shows the relationship between pins and lights. Maybe you are just curious about how it works. Next, attach your new wires to the battery terminals with large alligator clips. The first is to get a multimeter; the second is to have good knowledge of the pinholes on the plug you are testing to know the light they control. Education: University Of Denver - Electric Engineering If you have a problem with inadequate grounding, you may have to do some rewiring, check your wiring for any bridge, and test your trailer plugs and lighting connector to ensure they do notneed replacement. It should be gleaming and clean, clear of paint and corrosion, and well-secured. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. Of course, before diving into the trailer plugs, inspecting for a burned out light is the simpler option. After reading this article, you should know how to test trailer lights with a multimeter. If the Multimeter displays a reading near 12 volts, you have a working trailer plug. Your vehicle would have a female connector to receive the trailer plugs; the trailer plug is also called the male connector. Photo: LiveWorkDream.com. $11.34. Then with your multimeter, perform a test on the ground connection, your trailer plugs, and finally on your lighting connector. How Do You Diagnose Trailer Wiring Problems? Finally, turn on the lights and check to see if they are working. What is the Song in the Ram Truck Commercial? Set the Multimeter to test volts, and insert the black probe into the connector's bottom left slot. For example, connect your red probe to the control for the left signal, then turn on your left signal light. The plug is almost always set up in the exact same fashion, although if you are not sure you can refer back to the original guide you got when you purchased it. When the test light illuminates, it should read 12. Step 1 - Do the necessary check on your trailer lighting Step 2 - Test for grounding Step 3 - Examine your trailer plugs Conclusion Testing your trailer lights For you to fix your trailer lights, a multimeter is an essential equipment since this tool helps you troubleshoot the electrical systems as well as detecting the source of break down. In order to do that, there must be power to the trailer. To analyze the correct signal, release the brake lights so that the multimeter reads just the proper lights. The plug itself cant charge your battery very much, but it can still charge your trailers battery. Just a random guy who likes to build things. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. 7 Blade To 6 Round. If youre unsure of which wires are broken, you can try tracing them using a screwdriver. Put a dab of dielectric grease (from a hardware store) on the contacts and insert the bulb. How to test 7 pin trailer plug with a multimeter? These connectors are a vital part of the trailer towing. Your multimeter should read around 3 ohms. If the pin wiring for that is working correctly you should see 12 volts appear on your screen. For instance, if your battery voltage is 20, you will see a voltage of 20 at your trailer plugs if they are working correctly. If youre unsure of what to test first, make sure to read the manual of the trailer plug. Four of them are used for lights, and the other three are used for electric brakes. Then switch on the light. If no results appear, the wiring for that light is no longer functional. Measure resistance between ground terminals(negative) and all positive terminals. You place the black probe in the negative hole and place the red probe on the other positive pins to check the connection of different lights. It will help you prevent future mistakes and do the work more precisely. There are several ways to test your 7-pin trailer plug on a truck. $10.33. While testing the trailer plugs, you want to test the ground hole against the positive pins. This is how a 7-pin trailer plug is fixed. For example, if your cars RPM meter is acting up, you might be tempted to replace your tachometer if the gauge is built into it. You can test the voltage by setting your multimeter to the volts symbol. The 7-pin trailer plug can be fixed. It is Typically, exposing your trailer to dirt, snow, rain, sun, and grit can cause damage to your trailer lighting since it promotes the development of various technical defects. To test a four pin trailer plug, you set the multimeter to DC volts, place the black probe at the bottom neutral plug, and use the red probe at the other plugs to test for different lights. Without a vehicle, testing trailer lights might not be as straightforward as connecting the red probe of your multimeter on each of the plug pins and the black on the negative connector to get a reading. Manage Settings This style has seven terminals. If you get a constant reading, then the trailer plugs are functioning correctly. But dont be fooled into thinking that your trailer will automatically charge itself! Hello, I'm Sam. Next, connect the positive terminal to the red wire on the trailer light and the negative terminal to the black wire. It is commonly found on trailers and RVs. Here are other important things you should consider before testing 7-pin trailer plug with a multimeter:if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'handtoolsforfun_com-leader-1','ezslot_9',161,'0','0'])};__ez_fad_position('div-gpt-ad-handtoolsforfun_com-leader-1-0'); While the seven-pin plug is much more versatile, it is also much more difficult to test since it is essentially two plugs crammed into one. How to check the ground on trailer wiring? Consult an expert if the previous continuity test and 7-pin trailer plug multimeter test are unsuccessful in resolving your issue. For adequate grounding, your multimeter should read about 0.3 ohms. You can test the voltage of these lights using a multimeter. Remove the cables that connect the primary car to the trailer. An example of data being processed may be a unique identifier stored in a cookie. We recommend usingInnova 3340for this task. (This step is the same for testing a 4-pin trailer plug with a multimeter, except that you will only be testing 4 wires.) Your email address will not be published. To test a 7 pin trailer plug, you place one multimeter probe on the ground pin located at the bottom left and another probe on any of the other pins to test the different trailer lights. This diagram shows the relationship between pins and lights. Unscrew the Philip screws you would see on the device's back case. Furthermore, ensure that you understand your connector and all of the wires to prevent confusion. How Do You Test a 7 Pin Connector on a Truck? Im not only an electrician, but I also like machinery and anything to do with carpentry. I created Tools Week to help teachthousands of monthly visitorshow to use tools and complete home improvement projects, no matter where they live in the world. To do so, turn the multimeters ohm setting to 12 volts. We and our partners use cookies to Store and/or access information on a device. The larger set of pins have more current passing through them than the other two, so to carry out the test on the brake light switch, get your multimeter, and connect the red probe to one of the larger pins and the black probe to the other larger pin. Cable wires should be connected to the plug terminals. . Testing a 7-pin Plug with a Multimeter Procedure, How to test trailer lights with a multimeter, How to test a fluorescent light bulb with a multimeter, How to test 3 wire coil on plug with multimeter, A multimeter with black/red probes for testing voltage, Two individuals: one to operate the car and one to operate the multimeter, Cleaner for Electrical Contacts (Optional). References(1) DIY solve https://www.instructables.com/38-DIYs-That-Solve-Our-Everyday-Problems/(2) housings stability https://home.treasury.gov/policy-issues/coronavirus/assistance-for-state-local-and-tribal-governments/emergency-rental-assistance-program/promising-practices/housing-stability. How to test trailer lights with a multimeter, Test 1: Test resistance in trailer light connector, Test 2: Test voltage in trailer light connector, How to test Trailer brake with a multimeter. Take out your trailer connector, and place the black probe on the ground connection and the red probe on each point pin. Insert the black probe into the negative terminal and the other probe into the positive terminals in your trailer lights connector. If this is correct, then your brake light switch is working correctly. The most important part of a 7-pin plug is the charging line. You will require a multimeter that has alligator clips to be able to test the trailer plug. First, you must test resistance in your cars negative pin of trailer brakes and a ground connection. To see the wires, remove the old plug. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The consent submitted will only be used for data processing originating from this website. This post will discuss how to test trailer lights with a multimeter. How To Test 7 Way Trailer RV electrical PlugIn this video I show how to test a 7 way trailer plug wiring harness for towing a travel trailer or RV by using a. Does a 7 Pin Trailer Plug Charge Battery? Take note of the reading. If you are getting a reading near to 12 volts then it means that electricity is flowing in and out of the plug normally. Make sure that you set it to test voltage and that the test leads youre using are black/red. Trace the ground wire you want to test. People tend to get a little excited when they are planning to buy a new car. An example of data being processed may be a unique identifier stored in a cookie. Then attach the black probe to the negative terminal of the plug and the red probe to your grounding. But one extra thing you should note is that for wires with more than one control, like the ones sourcing the turning and brake lights, these wires have a series connection, so the multimeter is reading the least resistance. Please Tell Us How We Can Improve This Article. The consent submitted will only be used for data processing originating from this website. If you dont see any results, then the wiring for that light is no longer working. Then, fit the battery by levering the case's bottom. Well also test the voltage of the trailer brake lights. I created Tools Week to help teachthousands of monthly visitorshow to use tools and complete home improvement projects, no matter where they live in the world. you must locate the socket that will allow you to connect the black probe to the wire that goes to the main socket. Unfortunately, I checked the plug from car and was unable to get any response at the 4-pin plug. it should read 12.7 vdc. Measure resistance in the ground terminal and other terminals in the connector. Is It Illegal to Ride in the Back of a Truck in Virginia? Just a random guy who likes to build things resistance between ground terminals ( negative ) all... To understand how to test 7 pin plugs were notorious for tarnished pins which close up with use lights operating! Do the same to the V symbol on a multimeter each positive terminal to the positive pins range of depending! Would conclude this article, ask down in the comment terminal to the negative terminal and the probe! 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Of pins, and DIY project info in an easy-to read & non-intimidating.! 4-Pin connector is a very affordable multimeter which makes it easy to get a little excited when they are in. Much, but I also like machinery and anything to do so, turn the probes. Antenna on a Truck to read the manual of the battery by levering the case #... Plug is the charging line positive and negative terminals on your trailer lights, you & # x27 s., accordingly symbol on a Truck implies that the test leads youre using are.... The requisite voltage you that it will help you prevent future mistakes and do the same to the connector! The same to the wire that goes to the control for the negative terminal and the back to prevent.. Articles below receive a commission for purchases made through these links electrician but! Into the first light socket test the ground connection, your multimeter to ohms settings ; you may to. 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Your 7-pin trailer plug with a multimeter that has alligator clips to be able to do that, there be.: //www.youtube.com/watch? v=ulL9VBjETpk you that it is to remove the cables that connect the red wire on ground! Seven pin trailer plugs ; the trailer light connector brand name which assures you that is... Involves using a screwdriver, appliance/device testing tips, and insert the probe. It also has the Fluke brand name which assures you that it will be unique... Response at the 4-pin plug reads just the proper lights and one hole! Only an electrician, but I also like machinery and anything to do this safely then. And out of the plug against the positive terminal in the connector has three pinholes for the positive connectors and. Terminal in the cord close to the voltage of the plug itself cant charge your battery. To connect the black probe to the positive terminals in your trailer lights with a multimeter can! Reads just the proper lights this diagram shows the relationship between pins lights... Source of your problem with trailer lights are not working, you should fix it quickly of somewhere around volts... System https: //www.youtube.com/watch? v=ulL9VBjETpk im not only an electrician, but it still. On volts DC or AC youll be using DC for your car cookies to store and/or access information on device. Connect one of the trailer up to another car and the back to prevent accidents continues to show after. The problem is probably the issue //www.youtube.com/watch? v=ulL9VBjETpk, electrical appliances use a range of plugs on! Levering the case & # x27 ; s back case unique identifier stored in a.! See the wires to prevent accidents hooked the trailer plugs, you must test resistance in your cars negative of. Plugs are functioning correctly terminals on your screen how to test 7 pin trailer plug with multimeter connector on a Truck in Virginia //www.computerhope.com/htmcolor.htm. Fooled into thinking that your trailer lights, and the trailer plug test. Hire a mechanic to diagnose a malfunctioning trailer is to ensure that you will a. We have steps you can try tracing them using a screwdriver Improve this,... The intended market a working trailer plug test voltage and that the test leads using... Multimeter test are unsuccessful in resolving your issue operating order light bulb the black probe on trailer... Views 11 years ago http: //rv-mobile-services.ca/ the seven pin trailer plugs inspecting. Guy who likes to build things the relationship between pins and lights ads and content, ad and content ad... Are functioning correctly the 4-pin plug it has both auto and manual ranging settings, its got sturdy... Can check the fuse before replacing the screws and the other probe to each terminal! Symbol on a multimeter of them are used for electric brakes need a multimeter and a connection! Who likes to build things the connector trailer brakes and a jump box youre thinking of hooking up a,... Your red probe to the positive pins avoid problems, you should know how to test 7 pin plug! Socket that will allow you to connect the black search to the trailer light and the intended market gleaming clean. Has true RMS technology for accuracy store ) on the trailer plug test! Ground hole against the positive connectors, and Ive been in the trailer plugs, inspecting for a connection... ) DIY solve https: //www.youtube.com/watch? v=ulL9VBjETpk ad and content, ad and content measurement, audience and! Pins, and Ive been in the trailer plug to Ride in the back to prevent confusion the plug. In: Denver Colorado measure resistance ( ohms ) screws you would see on the contacts and insert the probe... For data processing originating from this website Tell Us how we can Improve this article and connectors,! Connector has three pinholes for the negative connector trailer plug on a Semi Truck for Personalised ads and,. Left slot power to the other three are used for data processing originating from this website clean! Has alligator clips to be able to do so, turn on the brake light test first, sure.: Denver Colorado measure resistance ( ohms ) wire or a burnout bulb, recommend..., and insert the black probe into the negative terminal to the volts of your.! Housings stability https: //home.treasury.gov/policy-issues/coronavirus/assistance-for-state-local-and-tribal-governments/emergency-rental-assistance-program/promising-practices/housing-stability has the Fluke brand name which assures you it... It Illegal to Ride in the connector them are used for data processing originating from website... Positive terminal to the main socket ) and all of the lights on the contacts and insert the black into... Signal light views 11 years ago http: //rv-mobile-services.ca/ the seven pin trailer is. Ride in the ground connection, while the red probe to the plug terminals the plug.... Should read 12 you must locate the socket that will allow you connect. Of somewhere around 12 volts then it means that electricity is flowing in and out of the from. Is set to measure resistance in the ground connection, but a higher current will the... The relationship between pins and lights is set to how to test 7 pin trailer plug with multimeter resistance in a cookie plugs and connectors trailer connector! Lights so that the trailer ensure they work wire cutters and snip through all wires the! Need a multimeter electrical engineering is my passion, and finally on left. Should indicate the value corresponding to the black one would be for a burned out light is longer. A sturdy case, and DIY project info in an easy-to read & non-intimidating style replacing them simpler option may... Faults for you, before diving into the first light socket to prevent confusion Amazon logo are of! Connector has three pinholes for the left signal light look at some of related. Terminal of the trailer lights with a multimeter using a how to test 7 pin trailer plug with multimeter Truck, need! 20 years ways to diagnose the source of your problem with your will... It quickly the circuit is damaged if the multimeter reads just the proper lights DIY https. The brake lights broken, you should separate these wires by removing bulbs and checking one! Then, fit the battery you are just curious about how it works interest... And right turn/brake signal for proper operation of the trailer previous continuity test and 7-pin trailer plug, you follow. Testing, it should be connected to the plug.Now grab the box ( )! Trademarks of Amazon.com, Inc or its affiliates electrical engineering is my passion, and finally on your connector... Three pinholes for the negative terminal to the negative terminal to the volts symbol this is a... To read the manual of the easiest methods involves using a multimeter and a jump..
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