Troubleshooting Running Lights on Trailer Not Working

Question:

What fuse would I look for ? My running lights on my trailer arent working but signals and brakes are ty

asked by: James C

Expert Reply:

The particular fuse you want to look for if your running lights on the trailer aren't working is something that will be in the owner's manual of your vehicle; it should specify in your manual "trailer running lights" or "trailer marker lights" or something of a similar nature.

You will also want to check both your vehicle and trailer connectors for corrosion, which can be green or white in color. A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you are going to need to either replace the plug or clean the corrosion. You'll also need to make sure your grounds are attached to bare metal surfaces and free of any paint, dirt or corrosion.

I have added links to a pair of help articles on trailer wiring, including a troubleshooting guide which I highly recommend taking a look at. Additionally, I also highly recommend using Dielectric Grease for Electrical Connectors # 11755 to help prevent any type of corrosion in your connector; using it will increase your 4-way's durability and extend its lifespan.

expert reply by: Kyle S