[Smoove1010]

msterling - thanks for the notes. After reading many posts about the door contact-switch solution, I tested them both. The drivers side was OK, the passenger side was not making contact. I removed and cleaned them both, and put new rubber booties on them. The dome light goes on and off properly when the doors are each opened and closed. The power windows still work all the time though, key in, key out, doors open or closed, doesn't matter.

So even though the door contact switches are providing a ground to the "window control unit" when the ignition is off and key removed, the windows remain powered. Could this be a failure of the window relay, i.e., the relay is stuck in the closed position? In my experience, relays usually fail in the open position, i.e., the contact points get corroded and don't make contact, which should result in the windows being inoperable.

Could it be a failure of the ignition switch, i.e., there's always power to the red/yellow wire feeding the window relay even when the key is off and out?

Am I correct in assuming that "window control unit" "window relay" and "window control module" are all different names for the same thing on an '87 Cab?

Next step: Check all grounding points. Any other troubleshooting suggestions?

Starting to wonder if my intermittent power door lock system is related in some way...

Thanks again for thoughts and suggestions,
GK