Doesn't this electrical stuff just drive you nuts?
I've had trouble on and off for years. Think I put in 4 alternators. After each installation things were fine. Last week it went haywire again. As a last ditch effort before sending the car off to the electical boys, I changed the bulb ( battery warning light ) in the dash. Light worked, put voltmeter on, and car was charging.
That was an easy fix, but I thought everyone who suggested it was nuts because car always worked with a new alternator.
GOOD LUCK!

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1984 MB 300SD Turbo