... it's a rebuilt alternator, from McParts (But it's a really nice local guy McParts, not a chain store McParts) - within the last year and a half.

Does that mean it's going bad or just that 21 year old wiring insulation isn't doing its job?

No reason to suspect failure, it's charging perfectly according to a multimeter. Just didn't know if that was symptom # 1 of bad alternators or symptom # 1 of old cars with old wiring.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL