"Alternator is spec'd for a 1970's model/ 6 cylinder GM, one wire. I understand the later (80's) 1 one wire alternators would excite on start up and at lower RPM."
NOT sure where you are coming from with this, but GM never used "one wire" alternators in those applications, or for that matter never made any 10SI's or 12SI's that were "one wire", at least for automotive use, AFAIK.
The "one wire" alternators are aftermarket bastardizations of the OEM alternators.
That being said, if the bearing/shaft area of the alternator is strongly magnetized ts should be charging, unless there's a stator winding or rectifier problem.
Also, you wrote:
"Alternator is spec'd for a 1970's model."
If a really early 70's it would NOT have an internal regulator, '70, '71, '72, and possibly some 1973 models did NOT have an internal regulator, although they are very similar in appearance to the internally regulated units that immediately followed.
If the two flat terminals are like THIS... I I refer to the "F" and "R" markings, (and IGNORE the "1" and "2") and it is NOT internally regulated.
If the two flat terminals are like THIS... - - refer to the "1" and "2" markings, (and IGNORE the "F" and "R") and it is NOT internally regulated.
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