Reverse Lights for Trailer- RAM OEM wiring

Grit dog wrote:
Ya, check ground from truck to trailer. Seems like first trip with the boat every year the rev lockout solenoid doesn't want to do it's job. Then when I get home it works! Rust in the trailer hitch tongue maybe?
Truck should have power there already as you found out.

I'm banking more on the thick factory coating on the frame. The trailer has a swing away tongue but I have the ground wire secured to the frame behind that.

I found the marker lights that weren't working had a hole drilled through the frame and it was relying on the threads of the bolt contacting the frame to get ground conductivity. Of course those threads were rusty so I scraped off a small area of the coating where the light body contacted the frame, slathered the fresh frame metal in dielectric grease, then reinstalled the lights. They worked perfectly after that. I'll bet I need to do something similar with the lockout solenoid.

KJ