Troubleshooting Trailer 4-Way Harness that Converter Shows Constant Voltage on Left Turn/Stop

Updated 03/17/2015 | Published 03/15/2015

Question:

Hi there, Ive been having trouble with my trailer wiring since I first installed it. Today, i decided to run a ground right to the negative terminal of my battery because I just wanted to take the bad ground possibility out of the mix. Now, I only have one consistent problem. My left signal yellow pin stays solid. The yellow wire going into the converter flashes when i test it but on the other sideoutput, the yellow pin stays solid. Im not sure what would cause this other than a faulty converter. Any suggestions? Regards,

asked by: Matt G

Expert Reply:

The converter you have is bad. If the signal going into the converter is good, but coming out of it is bad then the problem is a shorted out converter and it would need to be replaced.

Before you replace it you will want to inspect the wiring of your trailer to see if you can find anything that would cause the box to short out like corrosion or cut/exposed wiring. These boxes don't usually go out unless there is a short on the trailer that takes it out.

For a replacement wiring harness I would recommend the # C56331.

expert reply by: Jameson C