W108 3-wire window regulator to 2-wire car - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 10-02-2011, 08:06 AM Thread Starter
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Date registered: Mar 2011
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W108 3-wire window regulator to 2-wire car

Hi -- I am replacing the window regulator in a '73 280SE 4.5 W108 with a regulator taken off an older parts car ('68 280S). The problem is that the '73 model car is wired for a two-wire motor and the working regulator has a 3-wire motor. I can get the window lift to work by connecting up/down wires as usual and the ground wire (from the motor) to the door frame, but it's tricky (it's hard to get everything connected without blowing a fuse). But once the connection is made, there's a slow "tick tock" sound from the motor, as if it's continuously switching from up to down.

I've seen information here about installing a two-wire regulator/motor in a three-wire car, but not vice-versa. Does anyone have any insights on how I might get this to work?

Thanks -- if I'm in the wrong forum, let me know - I'm new to Benzworld.
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