Internal Reg.alternator on 69 valiant?

This is getting really common The squarebacks, generally are better alternators, if you are not concerned about "restore correct looks." CAVEAT!!!!! Make CERTAIN the modified brush is actually grounded, or it will not charge, and make certain the accessible brush is NOT grounded. That is, it should show a small resistance as opposed to a short, maybe 2-3 ohms or a bit more

The difference electrically, is that the pre-70 regulators controlled power going TO the field, which was grounded

the 70/ later cars had 12V direct to one field, and the VR controlled "the amount of ground" so to speak to control output. Isolated field alternators did not actually start with the squarebacks. The first isolated field alternators in 70 were roundback units.