Quote:
Originally Posted by crhenkel
Can a bad or failing blower motor resistor cause and increased voltage drain on the charging system? I have a low charging situation on my 1986 190e 2.3-16v and the drain gets much worse when the blower motor is on medium or high. I know it should increase at the motor speed increases but the volt meter is registering below 9.5 volts.
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A quick test you can try is unplug the resistor pack and see if the voltage becomes normal. My guess is your problem is in the charging system.