Almost certainly the problem here is the battery itself. Get it load tested or just replace it like others said. Only after you know the battery is good, consider other parts.
Boat terminals? The best thing to do when an old GM has battery connection problems is to replace the whole cable and terminal with a factory type not parts store junk.
Boat terminals? The best thing to do when an old GM has battery connection problems is to replace the whole cable and terminal with a factory type not parts store junk.
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