[bruca03]

i am in the middle of stripping my 300 and need to lower the windows in order to remove regulator.
my question, can i run direct power from battery to the two wires going to the power window motor?
thanks in advance..

 

[DeliveryValve]

Yes. Put the neg and pos each on the two wires, it will go in one direction. Switch the wire connection, and it will go the other direction.

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[bruca03]

Yes. Put the neg and pos each on the two wires, it will go in one direction. Switch the wire connection, and it will go the other direction.

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hi,
just to confirm so i understand what you are telling me.
run one wire from neg batt terminal to one wire running to motor, place a second wire from pos batt terminal to other wire to motor.
this sequence will turn motor in one direction.
i then switch the two wires at motor and will run in opposite direction.
thanks again for your help.:bowdown:

 

[mountainredneck]

green wire and black wire. reverse wires to obtain directional change.

 

[DeliveryValve]

hi,
just to confirm so i understand what you are telling me.
run one wire from neg batt terminal to one wire running to motor, place a second wire from pos batt terminal to other wire to motor.
this sequence will turn motor in one direction.
i then switch the two wires at motor and will run in opposite direction.
thanks again for your help.:bowdown:

Exactly. Also if your doors are still attached to the car, you can ground (neg) by connecting to a steel portion of the door and just run one wire from the positive pole of the battery.



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[bruca03]

Exactly. Also if your doors are still attached to the car, you can ground (neg) by connecting to a steel portion of the door and just run one wire from the positive pole of the battery.



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Great!
I now understand your first method. You just introduced a second method with doors attached. If I excercise your ground method, would I be correct to move the positive end to either of the two motor wires to achieve direction.
Thanks again for your time.

 

[mrspaz]

I don't have specific experience doing this with the Mercedes, but I have done it with other cars and wanted to give a general tip: Power window circuits often have a thermal breaker in-line that will cut power when the draw of the window motor gets too high (aka; when the window reaches the end of travel in either direction and the motor is pushing hard against the non-moving window). When you apply voltage directly to the motor wiring harness at or near the door, there's a chance you're bypassing the thermal breaker in the circuit. This means you have a chance to overheat the wires to the motor or the windings inside the motor.

If you're careful, it's not much of a concern; connect the wire to voltage briefly and be sure to disconnect it immediately as soon as the window is down, and you're good to go. Also, if the motor is of the type where the breaker is built-in to the motor itself, then you're covered. Someone else here more knowledgeable about the specific part would have to comment on that though.

 

[MBeige]

Edited title to reflect correct info. This should help others when doing a search.

 

[bruca03]

Applied power to the green and black wires and motor worked like a charm. Very smooth operation. Window came down, removed both 10mm bolts, in return allowed me to remove regulator. I completely stripped a door right down to the medal. Peeled off the chrome as well. 3 more doors to go. Maybe I'll do a write up on stripping a complete door.
Thanks guys.