Wiring Harness 118273 Not Powering Trailer Lights  

Question:

Expert Reply:

Thank you for your purchase from etrailer of the T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector # 118273 for your Pathfinder. If your trailer's lights are not working there are a number of troubleshooting steps you can take to try and remedy the issue.

The first thing to do is take a look at your owner's manual to locate any trailer fuses or relays and ensure they are all there and in working order. If they are, in order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 - and test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring somewhere that you'll need to trace.

If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if they are correct then your issue is likely going to be with the trailer side wiring. You will also want to check your trailer connector for corrosion, which can be green or white in color. A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you are going to need to replace the plug with # H20043.

I have added links below to a pair of help articles on trailer wiring, including a troubleshooting guide for you to take a look at.

expert reply by: Kyle S

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