Troubleshoot No Brake or Turn Signals on Trailer Being Towed By a 2014 Nissan Frontier
Updated 01/27/2026 | Published 08/15/2024
Question:
2014 Nissan Frontier SV. I have power to the trailer and have running lights but no brake or turn signals. All fuses and relays are good
asked by: Donnie P
Expert Reply:
Hey Donnie, thanks for reaching out!
Have you tried testing the trailer connector at the back of your 2014 Nissan Frontier yet? Try using a circuit tester like part # PTW2992 to make sure all of the functions on your vehicle are working the way they should - this also lets you know if the issue is on your truck or trailer side of things.
Since all of your fuses and relays look good, the issue is likely a bad ground or poor wiring connection somewhere. Check those for the functions that aren't working and you should be able to find the problem.
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Robin H.
1/27/2026
Hey Donnie, did testing the trailer connector on your Frontier with the circuit tester help you track down the issue? I'm curious if checking the grounds or wiring connections fixed the brake and turn signal problem. Your update could make it easier for others troubleshooting the same thing.