Adding relays to FB Power Windows
(the short checklist in-the-car version)

Turn off ignition
Disconnect battery (optional)
Remove driver's seat
Fold back carpet to locate harness
Cut red/blue, green/blue, red, and green wires about 3 inches from connector
Skin insulation of black and black/blue about 3 inches from connector
Jumper power wire to terminal 87 of each of four relays
Jumper ground wire to terminals 87A and 86 of each relay
Add trigger wires to terminal 85 of each relay, one wire per relay
Terminate red/blue, green/blue, red, and green wires going to motors, and connect to terminal 30 of each relay, one per relay.
Solder power wire from relays to black/blue
Solder ground wire from relays to black
Solder trigger wires to cut ends of wires from switches matching motor wires for each relay.
Tape up solder joints.
Test!
Tape up harness neatly.
Re-install carpet and seat.
Drive!