I had to watch a video on YouTube and on the product website. When I did, I found that the matching wiring harness was taped to the back of my automatic starter (the only place I didn't see it). Once you find it, plug one end into this wiring harness and the other end into the Tekonsha P3 and the wiring is complete. To be honest it took me longer to decide where exactly to mount the brake controller than the wiring even though the wiring harness was hidden. This strap was long enough that I could attach it to my driver's side knee. I will buy another one if I need to hook up another truck. Can't say enough positive things about this product.
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