Blue Field Wire Meltdown?

Shrimpy said
It reads around 3.9 between the 2 spades, 4.1 from green spade to the case, and 7.1 for the blue spade to the case. The numbers fluctuate greatly but that is the pictures of the most stable reading.

There's the problem. Neither field terminal should have any connection to ground.

The point of an isolated field alternator is the regulator controls the connection to ground.
Identifying Chrysler Alternators (1960-1976)