I found what I think is the voltage regulator. It has three hookups, the lower one has constant power, and the other two... I have no idea, the voltmeter didn't show any power, so I figure one is ignition? I didn't start up the engine, maybe I should have. Anyhow I hooked the positive wire for the fan to that instead of the battery.
I think I'm probably okay with full power all the time, where should I find the ignition wire to tap into?
And I learned something disappointing.. the side of the motor says 318, guess the previous owner lied to me or didn't know it wasn't a 360 :-(