I had a nonfunctioning front passenger side window. The nuisance
situation where the motor fails when the window is up so you can't pull
the whole assembly out. Thanks to an earlier post I replaced the motor
only by unscrewing the four bolts holding it to the spider gear
housing. I replaced the motor with a used one that I had in stock. The
motor worked and the window went up and down. Great! but there is a
downside (isn't there always) the battery started loosing charge. I
Pulled the door panel again and disconnected the motor at the terminal
block in the door. The battery drain stopped. I tested for current
flow to the terminal block with the ignition off and the window switch
in the normal position and found no current flow. I haven't reconnected
the motor but I assume that it is the problem. The question is with 12
volts to each terminal of the motor with ignition on and the teminals
alternately dropping to zero when the window switch is activated, how do
you test for a problem with the motor? Each of the motor leads shows
continuity to ground.
BTW I have a copy of the 1982 Electrical Trouble Shooting Manual MBNA #
SM1230 which covers in more detail sections of the wiring diagram,
components and location of each one with photos. This manual covers
240D, 300D & variations, 300SD, 380SL, 380SEL & SEC and Accessories for
all models. It has been a great help but it doesn't cover the problem I
am having with the window motor. Does anyone have any suggestions.
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