7 Way Trailer Plug Wiring. The black wire from the truck has power when the truck is running. They can be purchased as a standalone plug for the truck or trailer, or as a complete loop.
A colour coded trailer plug wiring guide to help you require your plugs and sockets.
If the trailer plug wiring on your vehicle or trailer is damaged or not working correctly, you can replace the connector with a CURT splice-in plug or socket.
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The black wire from the truck has power when the truck is running. The thing is I have to go to the tail lights to make attachments. If that's the case, you'll need an adapter so that the two systems can connect.