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vman580
01-21-2008, 03:55 PM
Help...I know this is going to sound like a simple problem but I just want to make sure the experts agree before I waste any time. My 1986 190D with a brand new battery needed a jump today. The lights, radio, and all other electrics are very low/dim or non existent.. There are no caution lights illuminated on the dash. When the car was jumped and running the wipers and horn are slow. Is it the alternator? And if so is there an easy way to get the alternator out?...I am 18 and have never done this before....Justin G

dembooks
01-30-2008, 11:25 PM
you need a volt meter

battery voltage key off = 12.6 volts

battery voltage with motor reving at 3,000 RPM = 13 - 14 volts

battery voltage during Pre-Glow, and during cranking,
MIN. of 10 volts

check the wires to the battery, clean the wire connections at the alternator, and the brush/voltage regulator on the back of
the alternator maybe worn out if you do not see any voltage increase
reving the motor. If the volts remain the same at key off - or lower volts when running - you have a alternator, or voltage regulator problem


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