Why are my travel trailer running lights not working?
Expert Reply: It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side trailer connector using a circuit tester such as # 40376.
How do you test a trailer brake controller without a trailer?
For that you can use a circuit tester like the part # PTW2993 with one pin grounded and the other on the output pin. Then you can hit the brake pedal of the vehicle and you should see the brake controller operate like normal.
How to test a trailer light without a vehicle?
So disconnect the trailer plugs, and use the wires on the pin to help you identify the specific pinholes you want to test. For a trailer light test without a vehicle, you would need some wires to attach your plugs to the battery.
How to replace trailer lights with LEDs?
One solution is to replace the trailer lights with LEDs. Disconnect the trailer from the vehicle and run a test to determine if the trailer lights function properly. Wire the vehicle side wiring harness to a standalone battery. All you have to do is link up the white wire to the negative and the colored wires to the positive.
How to wire a trailer light to a battery?
Wire the vehicle side wiring harness to a standalone battery. All you have to do is link up the white wire to the negative and the colored wires to the positive. If the trailer lights function with such a setup, it is clear the issue is with the tow vehicle.
How to troubleshoot trailer lights problems?
To troubleshoot the problems with your trailer lights, you have to carry out an all-round test; you might need a multimeter and some cables for this diagnoses. You should disconnect the wirings and connect the lights directly to your tow vehicle to be sure that you are not having a wiring problem.