This problem is VERY common on old fords and it is usually either the voltage regulator or the starter seloniod
The regs go out on a semi regular basis especially if the vehicle uses a lot of electrical current
I finally went over to a single wire alternator like hot rods use it moves all of the electronics into the alt plus uses a GM style internal reg to increase reliability.
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I never knew you could do that with an eggplant
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