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Re: trailer lights
Take the bulb out and check the voltage between each of the two contacts and ground. When you are checking to ground use the bulb socket then use the trailer frame and also use the white wire.
The current could be going from the brake light to ground but then has nowhere to go so it backfeeds from the housing ground thru the tail light filament and the tail light wire to the truck then thru the truck tail lights to ground.
One way of spotting this is to turn on the tail lights and then turn on one blinker. If your lights start acting funny then it's the ground.
James
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