Alternator Wiring Question

pstu said
I've been told I need a "one wire exciter" but I'm not clear on how I would wire this.

That's GM talk.

A 10SI or 12SI and later GM AC generators (alternators) have an internal voltage regulator that needs an exciter connection for low rpm and to get working. They also need a reference wire to know what the system voltage is. However they can also be wired internally with both of those inputs. Hence the 'one wire' alternators which are fine for tractors and such, and somewhat popular with hot rodders.

pstu said
I've also found that IGN1 and IGN2 are connected together from the ballast (B and A) and connected to the Ignition input to the Mallory Hyfire IV.

With a capacitive discharge ignition, that will work. It just signals the Hyfire to turn on.

pstu said
As seen in the diagram, the alternator has a wire going straight to the positive battery terminal. From the wiring diagrams I've seen, this is incorrect, it should have two outputs, one to the ballast and one to the voltage regulator.

Factory system from '62 to '74 ran the alternator output to a central distribution point were it connected with the main circuits using a welded splice. On a standard system it also jointed with the battery output/charge circuit at that splice.

In '65 they began installing a fusible link on the battery output to help protect the main circuits if any of the 12 gage wires grounded.