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| Mercedes-Benz 300SD |
Okay so I was with my dad toying with a
Mercedes – Benz 300 SD. Battery dies on it and so we have to jump start
it. So after we jump start it everything is fine, but then uh-oh, the
radio suddenly turned off and with it the lights on the dash, the
electric windows cease to work. Oh no. so I turned off the car and tried
to start it up thinking that if I just start it again everything would
be fine…but as you must be thinking now-duh-
why would the car start through the ignition if none of the electronics
work? We checked all of the fuses in the vehicle and none are burned
out. we know for a fact it is not the battery causing the problem.
please help I will take anything serious for an answer….
Answer: You may have several problems, but the first is clearly a bad alternator.
1) Get the car running, and measure voltage across the battery
terminals. Should be at least 13.5V. If not, you can try replacing the
alternator voltage regulator, but better economy may be to change out
the alternator.
2) If the battery is dying while the car is parked, you will need to
track down the drain. Install a good battery. With the engine off, using
an automotive ammeter with at least 20A capacity, measure the drain.
Remove the fuses one by one until the drain disappears. Then get the
shop manual, and trace out the failing circuit.
If you don’t understand this answer, get your car to a professional.
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