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The negative is isolated from the case, unlike most other alternators. So if the tech didn't bond the negative to the case, the alternators would fail the test.

Ok, sounds like exciter circuit problems on both alternators. You need to trace the wires from engine side to the generator lights in the dash. The light bulbs must illuminate with key on, engine off. The current illuminating the bulbs bootstraps each alternator, providing current to the...

Original 27SI alternators have 4 required connections. These are battery positive, battery negative, voltage sense and exciter-trouble light. On the driver side alternator, there is a brown wire that presses on a 3/32" smooth stud, about 5/16" long. This is for tachometer reading using...

11.8 volts is very weak. Both need to be 12.5 volts or more. 650 CCA is also weak. Test alternators per the sticky thread at the top of this forum, then load test batteries after a full charge.