Troubleshooting Trailer Wiring that When Connected Causes Issues on Vehicle Wiring

Updated 07/01/2019 | Published 06/30/2019

Question:

My left turn signal is very dim on the trailer but works fine on my truck. When left turn is used then my dash lights will flicker on and off with the blinker. All the other lights seem to be working properly after disconnecting the trailer from my truck. Any ideas why my lights seem to dim or flicker with the turn signal when hooked up to trailer

asked by: Tyler

Expert Reply:

Sounds like the trailer wiring has some issues. Most likely a short or grounding problems. I know that's not very specific but your best option is to start at the trailer connectors and make sure they are clean and free of corrosion and then work your way back on the wiring of the trailer fixing any exposed wire as needed. Also make sure the grounds of the lights are solid as well.

I attached a help article on trailer wiring troubleshooting as well.

expert reply by: Jameson C