Trailer Lights Stop Working with Running Lights and Brakes at Same Time on 2000 Honda Civic EX  

Question:

Expert Reply:

What you are describing sounds like a ground problem. Ground problems show up when there is more load on an electrical system. In this case, the constant power draw from the running lights combined with any other function presents the most power draw.

What you will want to do is make sure that the wiring harness is grounded to a paint-free bare metal surface on the vehicle. You might also try a different ground location.

On the trailer side, make sure the connector is clean and free of corrosion and that the main connector ground and all the light grounds are attached to clean and corrosion free bare metal surfaces. If this does not solve the issue then it is also possible that the lights are overloading the harness.

This harness is rated for a maximum of 3 amps for brake and turn signals and 7.5 amps for running lights. If the trailer lights draw more power than this then something is either not going to light up or it will blow the converter box.

If you find you are within the limits of the harness as far as power draw, then disconnect the trailer to test the converter on the vehicle. You will need a circuit tester like # PTW2993 if you do not already have one. Use the tester to test the wires leading into the converter while someone sits in the car and goes through the functions.

If the signals going into the converter are not correct, then there is some issue with the vehicle wiring you will want Honda to look at. If the signals are correct going in then test the wires on the 4-Way end of the converter. If they are not correct, then there is something wrong inside the converter and it will need to be replaced. I have included some links that will help troubleshoot for you.

expert reply by: Michael H

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