Ve have Vays of knowink vich vire goes vere!!!
You can see that in this picture:
The Center wire of each relay (87a) is a large gage black wire that goes to battery ground.
The 85's go to ground, also.
30's are large gage Red wires to battery +,
86's get the wires from the switch Blue/wht for up, Blue/blk for down, these are + when switch engaged
87's get large gage wire that goes to the window motor (Relay with blue/wht 85 goes to Blue/wht window motor wire(up), Relay with Blue/blk 85 goes to blue/blk window motor wire.
If you run a fused 10 gage Red/Black wire to each door, the relay wiring is actually pretty simple to do on the door and only a few more connections than the LMC harness... but the LMC harness makes it pretty simple to do.