K5 power tailgate window wiring

[kwmech]

So I'm helping out a friend with his 75 K5 and I've been trying to get the wiring sorted out from a previous owners cluster f... installing a painful wiring kit. (what a mess!!) Anyways the previous had run household 12 thhn wire down the frame rail to the gate and just kind of taped it all together. The switch under the dash....I don't know may be off of a monte carlo for all I know. So what I am looking for is a wiring harness diagram that I can reference so I get things together and working. The motor works with a power probe both directions but sounds kinda weak, but we'll see. Cable to the motor needs to rerouted so it will couple to the motor.