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Exciter wire voltages 200 1981

All the ground connections test well. I can use negative battery terminal, any part of chassis, or even any part of the engine. It makes negligible difference.
My question remains, why am I getting 15-16 volts on he exciter wire, on alternator, with engine running, while I'm only getting 13 volts on the positive alternator output terminal that feeds the battery?

Alternator is Bosch, rebuilt and guaranteed. I also had a new regulator/brush/diode module which I swapped with no difference.
I'm having the same issue with old and new alternator. I'm starting to think they are not the problem. I'm starting to suspect instrument cluster or ignition lock.






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New Exciter wire voltages [900][1992]
posted by  someone claiming to be Tim  on Wed Jun 5 13:49 CST 2019 >

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