This turned out to be the result of the brushes on the alternator
being worn out. Fixed that ($18 at Napa) but then the battery turned
out to be defunct too. Bought a battery from COSTCO for 56 dollars.
Same rating as the proper one ($180) but needed to make a custom
clamp from some angle iron to accommodate the slightly higher lip at
the base. Works like a charm at 1/3 of the price. The rest of the
battery is identical to the Interstate one I replaced down to the red
plastic cover on the plus terminal. I bet it was made by the same
people who make the Interstate battery. I can buy two more before I
break even. :)
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