I have a 91 350 SD which I'm lucky to say runs great, but all of a sudden none of the windows work. Fuses are ok and VO meter held on the top of each fuse's holder reads 14v. I had removed the little bucket below the ash tray and added some new wiring in that area for the vegetable oil conversion switches, but had not revealed the window switches or removed that panel with the shift lever plate.

I have read about ice cube relays, but cannot locate it. Fuse box or under dash? Any other central controls? Everything else on the car still works as far as I can tell (cruise, lights, etc). I held the window buttons while wiggling all the wires I could find, including the wires coming from the individual switches - no response from windows at all.

Thanks for any advice out there

Problem solved:

I started pulling off interior paneling and found a large wire connector disconnected on the left side of the center console. Even though the wires for left and right windows leave the console on their respective sides, at least some of them come back together again at this connector. The connector came loose when I was fishing wires up thru the panel for the vegoil switches and fuel gauge.