1991 dodge cummins lights pulsating?

double9

New member
lights are pulsating and battery guage on dash jumping up and down. I figured voltage regulator in alternator was bad. But it is still doing it with new alternator. battery is also boiling a little. Please help
just tied something for the heck of it, removed positive feed from battery while truck was running and the pulsing stopped. Does this mean that one of the cells in the battery is bad and not grunding properly?
 
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