Silverado 7 Pin Trailer Wiring Diagram. Does one of your turn signals not work and you're not sure Various styles of connectors are available with four to seven pins to allow transfer of power for the lighting as well as auxiliary functions such as electric. Look at the wiring diagram for your truck and determine the designation given to the ground location for the taillights.
I mounted the lights, but am not sure how to properly wire them up.
Use this as a reference when working on your boat trailer wiring.
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I am trying to determine which pins are necessary for backup lights to come on when the vehicle is put into reverse. Here is the wiring diagram for the trailer lights, there is a better diagram above in Kens post. If you want to install a brake controller that's another issue wiring-wise, and there are threads here which cover that too.