Maladd, that wiring sounds correct for a 3 wire hookup. Make sure your alternator is working, and your charge wire is correct gauge.
I use a voltmeter with my 12SI and not a charging light. My experience with a charging light is only on generators. My 12SI runs right at 14 volts. I have a junction point near but not on my starter solenoid. Both the sense (pin 2) and the Charging feed run to that junction, just like in Kenfuzed diagram.
review on
www.madelectrical.com, everything you need about 3 wire SI alternators is there.