When you look at your lights you will see there is only 1 wire for each, the ground is at the light on the trailer. I am not if you have screws or rivits at each. If its screws back them out and rescrew them to remove any build up it they are rivets I would replace them. You have another main ground where the bundle comes up on the trailer check that ground too. you may have a worn wie if the wrong light comes on and it is shorted check all connections and redo the seal and tape.
Hope that helps.
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Jim (SSG US Army Ret.) and Cheri (TSG Phx ANG Ret.) Mesa, AZ
2006 Dodge Ram 2500 HD Mega Cab Diesel | 2005 Honda Goldwing | 2006 35' Dune Chaser 5th Wheel
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