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Topic: Idiot light.
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post #4 of (permalink) Old 04-13-2019, 08:53 AM
John350
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Date registered: Nov 2014
Vehicle: 1990 350SDL, "Grandpa's Roadster" Project Car
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Most Bosch alternators of the era have what are called exciter diodes that feed the light. [s]I recall they are in the voltage regulator/brush block. Worth trying...[/s] They're in the alternator body itself. It's a common failure. We used to make up a diode pack from 3 1n4004 diodes and replace it without overhauling the whole thing. (on the alternators that were not internally regulated.

John
"Real engines don't have spark plugs!"

Last edited by John350; 04-13-2019 at 12:08 PM. Reason: I was wrong...
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