Troubleshooting Right Directional Signal Not Functioning

Published 03/30/2017

Question:

I have tested the right directional signal terminal on the 2013 GMC 2500 Sierra. Tester indicates intermitting source of current to the tester. What could be my problem? Thanks

asked by: Carroll S

Expert Reply:

If you are using a incandescent circuit tester like # PTW2993, you will see if the ground is bad because you will get signal to your tester with a solid ground that will light the bulb in the tester just like a rear directional blinker.

If the problem is with your 2013 Sierra, then it is most likely a ground near the tail light that is bad. If it is with a trailer, I would test the trailer connection on the vehicle first and then trace the issue back to either a shorted wire or a bad ground on the trailer. You will also want to check the actual bulb as well. Replace wiring or bulbs as needed.

I've attached a couple articles to help.

expert reply by: Jason S