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Problem on Trailer: Turn Signals Don't Work When Running Lights Are On  

Question:

When running lights are on turn Signals do not work. Turn off running lights turn Signals work ? All I did was put in new plug did one wire at a time.

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Expert Reply:

You have a bad or weak ground if turning on your running lights disengages the turn signals. You will need to ensure your grounds are attached to bare metal surfaces and free of any paint, dirt or corrosion. The ground wire should be firmly attached to the trailer frame and I am guessing this is loose, which is causing the issue.

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 connector's durability and extend its lifespan.

I have also added links to a pair of help articles on trailer wiring, including a troubleshooting guide which I highly recommend taking a look at.

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Kyle S

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