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Using Trailer Wiring Harness on a Honda CR-V All Trailer Lights Stay On


All lights are on, but do not function. No change when braking or turn signals. They all work as running lights. Have good ground, checked voltage and ground- White to ground- Brown has appox. 13.5 V and the green and yellow pulse between .05 V- 5 V when turn signal is on, and voltage increase when brakes are applied - I am confused- My rear lights have a White - Yel andYel/Brn, and Left is White - Green - Green/ Brown. I have all whites grounded to trailer as well as looped with wire back to white on Crv harness and the harness white is ground to chassis on 4 wire side of converter box. I do not know what else to check. Please advise.


Expert Reply:

On the trailer lights, white is ground, yellow or green is the turn signal function, and the yellow or green with brown is the running lights. Check to make sure that everything is wired to the correct wire from the trailer side 4-Way.

The lights should be grounded to the trailer frame near where they are mounted. Try removing the additional ground from the lights back to the vehicle. This does sound like a ground issue.

Unplug the trailer and use a circuit tester like # 40376 if needed to test the wiring on the converter. First test the wires going into the converter for the proper signal. If they are not correct then you know the issue is on the vehicle wiring. If they are correct then test the wires coming out of the converter box. If the wires are not correct coming out of the box then the converter is bad and will need to be replaced.

If the signals are correct going in and coming out of the box then you know the issue is on the trailer side. Check the trailer side 4-Way for dirt and corrosion and also check that the main trailer connector ground is attached to a clean and corrosion free bare metal surface.

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