When I installed my wiring harness, to power up the module, I ran the power line under the carpet alongside the green wire to the passenger side and hooked up to the fuse box in the cargo area. My manual says that F26 (not used) is 40A and for accessories, trailer tow module, so I connected to it with a spade connector and the 10A fuse holder supplied. The one thing I would do differently, is install the module on the right side, next to the fuses. That would require lengthening the left side wires, but would allow to use the hole in the wheel well that is there to run the flat plug through it; slice the plastic cap to run the wires, then fix it with some caulking. I believe the OEM module gets installed that way on the right hand side, hence the presence of the hole and cap. I duplicated that hole on the left side, and that was painful, but I didn't want to cut and splice wires at the time.