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#7 pin trailer plug tester how to#
#7 pin trailer plug tester free#

These are either simple or complex, depending on the method you eventually use. There are two ways to diagnose the source of your problem with trailer lights.

#7 pin trailer plug tester how to#

How To Test Trailer Lights With A Multimeterĭiagnosing A Problem With Your Trailer Lights.

Diagnosing A Problem With Your Trailer Lights.

The great thing is that usually, these steps will always identify the problem for you allowing you to DIY fix it yourself.In this guide, you’ll learn the following: If the above troubleshooting and the continuity test doesn’t solve your problem, then it’s time to take it to a professional. Then insert it into the socket and grind out any corrosion. You can use sandpaper by rolling it around a metal rod and connecting it with tape or glue.

Sand away corrosion on the sockets which can often occur from water getting into the socket.

This is often the first thing you should do as it most commonly will be a burnt-out bulb.

Replace the bulbs which are not working as it may only be a faulty bulb and not an issue with the 7-pin plug.

If it’s loose or not connected to the metal it may not be getting grounded which can cause your circuit to be broken.

Check the ground wire to see that it’s connected tight enough to the metal frame of the vehicle.

You can use a brush to clean out the inside contact pings to ensure it’s clean which often can cause a disconnect in the circuit.

#7 pin trailer plug tester free#

Clean the connector plug using an electrical contact cleaner to help ensure the plug is free from dirt and dust.

If you have a specific light burnt out and you’re not sure what is causing it, testing for continuity is one thing you can do, but there are additional tests you can do that may help restore power to the circuit. 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 you’ve eliminated any of them as issues. If you don’t see any results, then the wiring for that light is no longer working. If the pin wiring for that is working correctly you should see 12 volts appear on your screen.

Step 3Īsk the person assisting you to then press on the brake light. You can then move the red probe into the first light slot – let’s pick the middle right slot in the plug for the right brake light. Now to test each of the lights to determine if any of the wirings for each light isn’t working you will leave the black probe into the grounding slot of the plug. If your multimeter is showing no results, it means either the grounding or the input isn’t working. If you are getting a reading near to 12 volts then it means that electricity is flowing in and out of the plug normally. Insert the red probe into the top right slot of the plug. You can insert the black probe into the bottom left slot of the 7-pin plug as that is the grounding wire. When your multimeter is set to test volts, you’re ready to start. Next, insert your black lead into the COM port and your red into the voltage port. Turn your multimeter to the V symbol on a multimeter dial. To test if any of the wirings in the 7-pin plug is not working you will need to use your digital multimeter and ensure it is capable of testing for volts. How to Test 7-Pin Plug with a Multimeter - 4 Step Guide If you are not sure which is which, I will also show you below how you can find out using your multimeter. A typical 7-pin plug will be setup in the below fashion: 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. You may have other types of plugs which have 3, 4, 5 or 6 different connections but for this one, I’ll focus on the most common 7-pin plug. The 7-pin trailer plug is complicated because it hosts 7 different connections all in one (watch the video right below this paragraph).

The configuration of the 7-pin Trailer Plug 2 people – one to run the vehicle and one to run the multimeter.Multimeter with black/red probes that can test for volts.You’ll need the following items in order to test it effectively: We recommend using Innova 3340 for this task 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.īut 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.