common problem is the battery leads.... corrosion between the throughbolt to metal eylet. pull terminals off check for corrosion at mating surfaces, then pry the throughbolt out of its plastic sheath
and see if it has corrosion where those 2 mating surfaces is. i must have had a 100 gm cars come in for this problem. would take a 5/16 wrench, flat screwdriver & wirebrush out to parking lot. never bother to even pul the car in the shop.
corroded/or bad connections will cause low or no charging of the battery. just to make it clear.
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