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The W123 chassis covers 240D's, 300D's, 300TD's, 280E's, and several other models of Mercedes coupes, sedans and wagons from model years 1977 to 1985.

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W123 300 coupe rear window

Doing online research about rear window problems ( not rolling all that way down) I've found that is a very common problem, however, answers never seem to be accurate on how to approach the problem, some guiding towards regulators, others to switches etc .

My own problem is that window stop rolling down , when is 3/4 open and 1/4 left to be totally .

Can you please share some data base on your experience at this matter ?

Thanks you very much .

Mauricio Q.

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Your best option would be:

Check power to switch

Check power from switch whilst !#^&^$^ button(do this at regulator/ motor)

Now if they both equal around 12V

If you can see the rails make sure they look right

Now with the motor removed You will have to "bench test" motor/ regulator when doing this make sure it rotates though full motion

If it doesn't then that is problem

I can possible suppy a wiring diagram later today or tomorrow

Best of luck

Alex

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Thanks Alex, will do. Look forward to ques diag,

hi

sorry about this but i could not find a wiring diagram

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