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warning lights on, no charge from alternator 200 1984

posted by  johnstr on  Sun Jun 20 09:18 CST 2004
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We've got a 1984 240. Warning lights (battery, charge, brake and parking brake) stay on once engine is started and idling. They dim to black as I rev up the engine. Battery voltage stays around 12 volts whether engine is off, idling or revving, so the alternator isn't charging it. Obviously the battery goes dead after a while; these symptoms are with a freshly charged battery (all symptoms are the same when jump-starting, by the way).

Is this a bad alternator/voltage regulator, a short/ground in the wiring harness, loose belt, or something I'm not guessing? Thoughts on how to test/fix, or on what to tell a mechanic to avoid unnecessay alternator replacement?

Thanks in advance. RRJ






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