Originally Posted by mclaypool
I am trying to install a new driver's door power window regulator in my 1967 250s. The regulator that was removed from car had a motor with 3 wires. The new regulator has a motor with only 2 wires. Does anyone know how I can wire this to work in my car?
Here's the likeliest situation: Power window motors will accept 12v+ signals from the relays GermanStar is referring to, up in the fuse box. This input is based on your finger's input at the window switch. Depending which way you want the window to move, one of those wires will be the up 12v+ wire and one will be the down. When there is a third wire, it'll be a 12v- ground wire. These motors are fairly unique in that they can reverse directions.
My suggestion is to verify my comments on your car by testing:
1. Open up the passenger door and test with a multimeter which wire color is up, down and ground. Ground will typically be brown.
2. Compare your results with the wire colors on the driver's moyor/regulator you are removing...often an up wire will be blue and the other will be blue with a stripe. Or green and green with a stripe. You should be able to figure it out that way.
3. As for installing the two-wire motor...this is the likely situation: The ground wire has been eliminated because it is likely the motor/regulator will end up bolted to the door which is connected to the frame which is grounded. I'd suggest you take the ground wire of the three wires already in the door and put a ring connector on its end and connect it under one of the bolts holding the regulator in place.
3a. Now all you have to do is to figure out which of the two new wires is up and which is down. It doesn't matter. Hook them up and try it. If the window goes up when you exoected it to go down, merely reverse them..You're done.