Power comes via a 12ga red wire from the dash harness down to a 3-prong relay (located just to the lower left of the steering column), where a 12ga tan wire continues to the left and into the kick-panel cavity of the driver-side.

I added relays to all of mine, per a recommendation by 1_WILD_RT, and have been very happy with how much better they work. It removes the load from the window switches. I have an old thread on here somewhere with the details of how I did it.

Darren