I've got a 1999 Ford Ranger that I've had for a while now, and I'd like to add power windows, power door locks, and power mirrors. So, I decided to see what I had to work with. On the passenger side door harness, the block is fully populated, or real close to it.
So next I took my owners manual and checked out the relay box under the dash, fuse panel, and power distribution box. All the fuses were there, and all but one relay was present in the under-dash box, which in that slot there wasn't even a socket for it to slot into.
Now this is where things get interesting. I popped off the driver's side panel and low and behold, the door harness has four, or five wires, not the bundle in the picture above.
It's like the vehicle is 75% prewired. What does this mean for me?