Trailer Hitch Wiring Adapter Diagram. Many different harness types are used to connect tow vehicles' power sources to the electrical wiring on trailers. Go to your local auto parts store and ask the specialist which adapter you need, if you don't feel comfortable picking it out "Saturday Mechanic: Wiring Your Trailer Hitch." popularmechanics.com.
No, IMHO, you don't really need the Toyota wiring harness.
The metal-to-metal contact in the hitch is not.
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Just about any local auto parts store will have the right adapter for your vehicle. Custom wiring diagrams that don't fit in one of the other categories. If you're towing just for the day and don't ever plan to tow again, you can pick up some adapters that replace the taillight Always run a ground wire from the frame of the vehicle (not from the hitch or bumper) to the trailer.