Depending on direction of rotation, one lead is positive and the other is ground. (Reversing polarity reverses direction.)

Put the positive lead on one wire and the negative lead on the other instead of the motor and see if it works.

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current vehicles:
'82 240D - 125k - daily driver
'85 380SE - 299k - on dry dock
'87 Vanagon - 183k - sold

Tango I did try to check it the way you said and all I got was a big spark nothing moved any way I tried it.Also a little confused the picture I showed is that just the motor or is it motor and regulator?

I did some checking on Fastlane and it seems there are 10 differant motors for my car 6-front 4-back. There are 3 differant drive gears 8-10-and 14 tooth.I have an 8 tooth Brose-Cobury.This tells me they are not interchangeable from any one door to next do not know why M.B. had to make everything so complicated.Still wondering if this one can be repaired as I read that sometimes a bearing freezes up or the brushes go bad.

Here is a couple good threads. post# 6 shows the motor taken apart.
Anyone replace a window motor in a w126?


this is for a W123, but same thing.
123 window lift motor?

I asked the question in this thread if another window motor could be swaped into another gear Housing. didn`t get an answer, and haven`t tried it. a possibility. some of the window motors are NLA.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

The pictures shows the motor and drive gear. The regulator is the system of arms/levers that translate rotational movement into up and down movement.

Update on the window problem I found a used one off e-bay and bought it while waiting to receive it figured I would start taking out rivets and try to see if I could repair old one but before I started gave it one last test with direct juice and low and behold it worked both ways so threw it back in and if it happens again will put the other used one in and then rip this one apart to see whats going on can have it in and out now in probably 1/2 hr. just hope it do'nt get stuck down on a long trip in 0 degrees or pouring rain.Thanks for the replys and info. how to test them the window works.