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Old 05-10-2002, 09:10 AM
bogner24
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Angry Charging Hassle

This is the goofiest thing: My 77 300D charges sometimes and sometimes not. I replaced the battery (it was pretty old) and the alternator (it was grinding). The thing is that the battery light should come on when the key is in the pre-glow position-sometimes it does and sometimes it doesn't. Does MB loop the charging system through the key cylinder? I'm lost.

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Old 05-10-2002, 01:00 PM
Robert W. Roe's Avatar
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Join Date: May 1999
Location: Lehigh Valley PA
Posts: 1,330
Make sure all the terminal blocks, battery connectors, and spade lugs that go to the terminal block are all clean and free of corrosion. I like to use a "Scotch-Brite" type of cleaner pad to remove oxidation from electrical connectors. It doesn't scratch like a wire brush. Good luck, Bob
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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic
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Old 05-10-2002, 07:15 PM
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Location: Evansville, Indiana
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Yes, the alternator is switched via the keyswitch. If the switch is bad or the wiring loose, you could be not charging the battery when the contact does not close or the wire is loose.

Check the condition of the connectors at the alternator, too -- they can be corroded and work fine until removed and replaced, when crud gets between the surfaces and prevents contact.

It is also possible that the voltage regulator isn't making good contact with the slip rings -- same result.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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