I need three, for an 87 300TD. Not sure what other years/models may be compatible.

Let me know how much if you've got some
Would love to get all three from the same place

I habe over 30 motors.but got to know.number.of.teerh on the gear motor plus.a poc.would.help are u sure.you got 3bad motors.? How.did you check them.?would.like.to belp.u

Do you have your door panels off?

Are you sure its actually the rear regulators not working? The early cars are notorious for having wiring issues in the b pillars, plus problem with the switches in the dash and the door.

Get the door panel off and take the window switch connector apart to apply current direct to the motor. Give the motor a tap with a hammer as well.

I have a passenger front regulator and motor.

__________________
David Hendy
'97 Renntech E60RS
'97 GMC 2500 Sub' Diesel
'95 E300D
'88 300TE
'88 250TD
'84 L/Rover 109

It's a friends vehicle. I have not checked it out. Supposedly the switches work fine, they've been swapped out/tested.
So the wiring is the best place to check next?

Clean the contacts where the wires connect inside the door.

Ok, just found out that all three actually went at the same time.

Is there a central relay or controller for them? Or are they wired in a series?