"My brother helped me install them today. Took most of the day since neither of us is an electrical expert. It is essential to have a digital voltmeter (& operational knowledge) & eight 22 - 18 gauge wire tap-in connectors (two for each door). This is the way we did it (not necessarily the correct way, but it worked)! We started w/ the rear doors first.
After removing the door sill, cut the tape around the wire bundle to better access the wires. There are 4 or 5 red wires...use the voltmeter to find the one that has a load of 12v (all others will be 0v since nothing else is ON besides the dome lights). Connect this red wire to the red wire of the new door sill.
Next, you will be testing the green wires in the bundle. While touching one end of the voltmeter to the red wires that you just wired, use the other end of the voltmeter to find a green wire that has a 12v load but has a 0v load when you push the door pin (which controls the dome lights). This will be the green wire that actually runs to the push pin switch. Connect this green wire to the black wire of the new door sill. While crimping the wires together, be sure not to touch your metal pliars to the frame of car or you will get a nice spark & it is guaranteed to scare the hell out of you (although you won't feel a thing) & probably blow a fuse (the 25amp one on the top of the middle row in the fuse box).
For the front doors, there is a bundle of wires the branches toward the center of the car. When locating your red & green wires, test & connect behind this branch (toward the rear of the car and not in front of the branch). Otherwise, the front sills are exactly the same as the rear.
It really is as simple as connecting two wires, but finding those two wires is the challenge."