Car: '81 300DT
Problem: The rear left electric window won't roll up. It'll roll
down just fine, then it's stuck. Same problem whether from the door
switch or the counsel switch. Problem came on suddenly after I did a CV
R&R.
What I've done: I removed the window motor. On the bench it works
perfectly-up and down. I reinstalled it and swapped out the relays,
swapped switches with a working window. Still doesn't roll up. Wiring
looks fine. (I roll it up with my battery charger across the electrical
pins. That works perfectly which makes me think the problem is outside
the door)
Next: Start chasing the circuit and see where the power stops.
What I'm hoping for: Someone to say, "Oh, yeah. I dealt with that.
It's this..."
Any suggestions appreciated. Thanks.
Richard Sexton - 16 Mar 2006 04:38 GMT
>pins. That works perfectly which makes me think the problem is outside
>the door)
Have you installed just the window and see if it moves freely
up and down? It could be binding mechcnically. I would have tested
for +12 at the motor with the switch in both up and down positions.

Signature
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net
avalondarkside@gmail.com - 16 Mar 2006 05:41 GMT
Thanks for the response. Since it goes up nicely offa my charger, i'm
guessing the mechanical is fine.
Richard Sexton - 16 Mar 2006 07:23 GMT
>Thanks for the response. Since it goes up nicely offa my charger, i'm
>guessing the mechanical is fine.
Reverse the wires to the switch, see if up is now down and down is
now up.
I'm *guessing* bad ground someplace. One handy trick is to put a test probe
on a long wire to the 've terminal of the battery and check grounds everyplace.

Signature
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net
dratwal@aol.com - 16 Mar 2006 23:15 GMT
> try opening and closing the door while the switch is depressed ,they used to suffer from broken wiring loom in the b post (piller between both front and rear doors) caused by door bending loom back and forth .If window rools up when door is moved might be your answer.