These type of problems are hard to diagnose, but since you are getting 12 volts to the motor (since you need to "jump start" it) I do not think that there is a problem in the car, but in the motor. You might want to try spraying the brushes with "wire dry". This is the same stuff that you would spray on ignition wires or a distributor cap if it gets wet. Something else is WD-40. It is supposed to displace water. Another thing that you may want to think about is getting a newer unit from a retail outlet like Pep Boys (or its equivalent in your area).
Bob, The Auto Answer Man
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