Trailer Wiring Information:

The following diagram conforms to the standard agreed upon by vehicle manufacturers and companies producing the trailer connectors.  This will allow you to hook up your old trailer to a new truck, or bring home a new commercially built trailer without any wiring hassles. The 7-blade connectors are the most widely used, and even if you don’t need it now – you will save yourself the hassle of upgrading at a later date when you buy the next bigger and better trailer.  (Backup lights can be hooked up to 7. Auxiliary Yellow).

 THIS VIEW IS LOOKING AT THE TOW VEHICLE RECEPTACLE ON THE SCREW TERMINAL SIDE (the inside of the socket where the wires attach). 

(This is also the view of the exterior trailer connector pins)

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THIS VIEW IS LOOKING AT THE TRAILER CONNECTOR PLUG ON THE SCREW TERMINAL SIDE (The inside of the plug where the wires attach). 

(This is also the view of the pins when looking inside the cover of the tow vehicle receptacle)