10-SI Delco Alternator

[tomfg]

Installed a Voltmeter in my dash, and came to the conclusion that my Delco 10-SI alternator regulator may be bad, as it's charging a over 15 volts on fast idle, and when warmed up, it only goes down to 14.92 (measured at battery with my VOM). With the heater blower blowing on high, and the high beam headlights on, It only goes down to 14.6 volts.

Studied up what I could, and it appears it's wired okay, I have voltagage from an ignition switched source, and the sensing wire is okay.

I know the 10-SI alternators aren't too outragously priced, but I'd like to order a kit online to replace the regulator myself, but I'm at a loss
to which regulator part number I need for the two wire alternators
(3 wires counting the fat bat. wire)
I'm guessing the Alternator would be the same vintage as the engine, circa 1978. It's a 63 amp version.
Part number......
1103 09 1K 63A

Any help on the regulator would be great.

Also is there any wiring diagrams out there that show how the factory gauge clusters were originaly wired? I have a factory wiring diagram, but only shows the clusters with idiot lights.

Thanks!