From what I've been reading the capacitor in an alternator
has three diodes and a ground. Ohm resistance should only flow in only one direction
across the diodes. The capacitor turns AC current to DC current.
Please correct me if I'm wrong.

Are you saying that an alternator doesn't need a capacitor?
Also, that doesn't answer my question about whether or not I
need to take the alternator apart to check the diodes in the capacitor.

Thanks,
Jeff

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1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end