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Old 07-02-2003, 09:52 AM
K Juul
Posts: n/a
380SL Charging problems

Looking for help troubleshooting a charging problem. The car runs fine, no Batt light, however seems to discharge the battery as it is run. Took it to Auto Zone, they did the load test on the Battery, said it was fine, except battery was discharged. Jumped the car to get it restarted, they checked the alt, voltage was 13.5, but charging amps were low, about 20. Replaced the voltage requlator, the brushes were about half worn. The overall condition of the alternator seemed ok for an 18 year old car, did not see any diodes to check, are they inside? Charging voltage now is still about 13.5 which seems low, haven't had a chance to check the charging amps yet. I have the MBUSA CD, information on the charging circuit is very slim. Are there any fuses/relays/links that need to be checked? Any known problems with the battery in the trunk? As I sit at work writing this, I can't say for sure that the battery light comes on during the prestart light check, but I didn't notice that it didn't. I know on my BMW, if the light is faulty, it disables the charging circuit. Is that true in this case? Hope to drive the car over the holiday weekend, help please!
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