Got a quick question and I can't find the answer with google...

I have aftermarket power windows in my truck. The harness supplied with the kit has wire that's a tad too small to run the motors efficiently. Going down is no problem, going up the motors struggle.

I've run a new, 10 awg wire to each door that'll supply battery + power to run a relay in each door for the "up" side of the circuit.

Now, the issue is.. the motors simply have two wires running to them.

One is +, one is -

The switch in the door reverses the polarity of the wires to reverse the direction of the motor. Therefor, I need a way to wire in a relay so it's normally closed position is to ground, and when activated it pulls high. How the heck can I pull this off?

 

I'm just slow today, figured it out.

Pin 86 switched 12v in
Pin 85 to ground

Pin 87 high current 12v in
Pin 87a (normally closed) to ground
Pin 30 to wire that gets either ground (inactive) or 12v+ (active)