Still sounds like it might be charging issues, but it also sounds like you've got tons of other wiring cocerns!
The 3 wires on the starter are the main battery, and the start signal, plus the idiot light or volt meter. All three wires will be used regardless of which distributor you have, as the extra wire is going back to the alternator, or regulator to sense voltage drop.
If by chance your battery had an open cell it can and will often take out your regulator, alternator, or both. But if the same components go bad a high charge rate will take out the battery too, so no way to know which is the cause. It's best to pull your alternator and battery, and have them both tested to see which might be bad, or if both are bad.
Get all the wiring cleaned up, safe, and properly hooked up before replacing any defective components.