Hello,
Well, I finally took some time from enjoying my long weekend (hope you're having a good one!) to take a look at my car. With the car running, headlights, fog lights, hazards, blower, radio all on, I didn't find any voltage drops between the positive terminal of the battery and the alternator. I tested the connection at the starter as well, no drop there. I connected the negative terminal of the voltmeter to ground and re-tested everything, the voltage reading at all points was the same, about 10-11V (decreasing slowly over time as the battery drained).

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1985 300DT, Classic White, California, 175K
1984 300TD, Classic White, Euro, 285K


"When nine hundred years old you reach, look as good you will not. Hmm?" - Yoda