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After a few voltage checks under load, I realized that there was high resistance at both the alternator output (positive) and case ground (negative). So I pulled the smog pump & alternator to fix it.
The burned spots on the ring terminal & the alternator output nut (in the red insulator) show that, at some point, this was loose enough to spark & get hot. Now, it's also corroded slightly. It all needs to be clean & tight.
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