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1985 944 ground problem?

Electrical

Vehicle Information: Year: 1985; Engine (type, size, modifications): 2.5; Total Mileage: 120K;

This is about my son's 944. It is is super condition but I think it has a ground problem which is causing the battery to drain.If the headlights are on and the car is running the power windows will not raise or lower.If the headlights are off and the car running the power windows will raise and lower but a little slow compared to newer cars.I noticed that with the headlights off, and the car running, if you to lower the window the headlights come on (but are in the closed position without the motors activating to raise the lights)I have gone over the electrical schematics and can not find anywhere where the potential ground problem could be coming from. Any Ideas? Could a bad window switch be causing this to happen?Also We will be replacing the raditor in a couple of weeks. Do you have a procedure for this?I have done this on many of the cars I have owned and this one does not look to hard, but I don;t want to overlook anything.

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