Troubleshooting Only One Turn Signal Working for Trailer Wiring Harness

Question:

I purchased a hitch and wiring harness late last year. Lights on trailer worked when I tried then. Hooked up my trailer and only my right turn signal works. I am not getting any power at the plug on vehicle side. Fuses are good. Checked ground that’s good. Lights on vehicle work fine. Any chance it’s a bad harness?

asked by: William N

Expert Reply:

It is possible it's a bad harness but a lot of the time it's just that the harness isn't making contact like it needs to the harness of the tow vehicle. Typically just unplugging the harness and plugging it back in will fix this problem. If not, then the issue is the harness.

expert reply by: Jameson C