7 Way Trailer Wiring Harness Diagram. If you are wiring a harness on a vehicle that has an existing warranty, professional installation of the plug is recommended. This flat connector is good for smaller trailers, but since the new BTW, I'll bet that all Highlanders come with a "prewired harness." If anyone without the towing package can confirm this, then anyone wanting to tow a small.
The thing is I have to go to the tail lights to make attachments.
Look at the wiring diagram for your truck's ignition switch.
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Determine which color wire supplies constant power to the ignition switch. The question is if I cut the wires at the hitch side will it work with the diagrams shown. One has flat pin and the other has round pins.