Quote:
Originally Posted by Gnarvan
When I was under the van this morning tapping into the tail light circuit on the trailer wiring harness for the license plate light I did notice something a bit odd. The stock trailer wire harness is a 4 wire. It looks like there may be a larger possibly 7 wire connector plug attatched to the frame rail on the drivers side just aft of where the 4 wire connector plug and harness departs to the hitch. If possible I would still like to find this circuit under the dash somewhere. Hopefully by the fuse box.
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Yup. That's the HD towing harness connector. Relay is (or should be) in the power distribution box under the hood. It's always a pleasant suprise to go looking for another circuit somewhere, and it turns out the factory already put it there
Of course, I usually don't realize that until
after I've already run my new circuit.
PS - for running your switch to the stock relay.... Ford already has included some "pass-through" circuits that run from the connector near the brake pedal, into the hood compartment on the driver's side.