Overcharging Help needed (74 scamp)

70DUSTER/74SCAMP said

stumbled upon a bad conncection at the bulk head for the main hot wire that comes in to the car its hanging on by a thread of wire so going to drill a hole in the bulk head connector and feed some new 10-12 thru the hole . if u jiggle it now the car jut dies( previous hack job by other owners)

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I think you have most of the concept correct.

A bad link in the battery line could explain what you see.

Don't drill! OK. Actually maybe drill, but not yet! ;)
That's probably the fusible link. Replace that. It's the only protection against an accidental grounding in main circuits. Say someone accidentally touches the alternator output post to ground with a wrench. Or - and this happens - the output circuit grounds (loose, damaged or badly assembled alternator). The fusible link will minimize the damage and prevent a fire.

So fix that. You can buy factory looking replacements that plug in, snag one from another harness, or make one up from the parts storeif you have the terminals and crimpers.

Drilling I'll come back to...