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Troubleshooting 2003 Chevy 2500 Trailer Light Issues

Question:

The 7pole trailer plug on my 2003 2500hd the right turn and brake light is always hot causing the right brake light to stay on on trailer.i know rv is ok.and truck lights r fine.check signal switch and wire harness all ok as well as fuses.if I removed flasher relay it goes off.and when I reinstall its fine till I use right signal.i am leaning bad relay.thoughts thanks

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Expert Reply:

For your 2003 Chevy Silverado 2500 HD, if you are experiencing the constant hot on both the trailer and the vehicle, then it is a bad relay. If you are experiencing just the trailer staying hot, then it could be a bad relay or it could be a connection or ground issue as well.

It sounds like you have tested your connections independently, but you may want to use a little sandpaper to clean your connection between your truck and trailer and use some dielectric grease like # 11755 to keep moisture and corrosion out. You will also want to check your trailer's ground connection at the main ground as well as at the tail light as they are often independently grounded through the mounting hardware. Make sure the connections are bare metal to metal with no corrosion, debris, or even paint.

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