Troubleshooting Trailer Turn/Stop Circuit that Doesn't Work

Updated 03/22/2018 | Published 03/20/2018

Question:

I have no turn signal but light works/ Could the turn signal be burnt out?

asked by: Dave J

Expert Reply:

Most likely the trailer taillight you are referring to has a weak ground. The brighter illumination of the turn/stop circuit of a light draws more than the running light. So if there's a weak ground it will show up with that circuit.

Try improving how the taillight grounds to the trailer. You can even run the ground wire up to the main ground harness and you should see it start to work again.

I also attached a help article on trailer lighting for you to check out as well.

expert reply by: Jameson C