Wiring up the GM 10SI Alternator - Old Engine 10SI Alternator Wiring. The 10SI has three terminals (including those with a 1 wire regulator). The large "BATT" terminal which gets connected to your battery positive. GM 10Si alternator wiring issues | The H.A.M.B. wwwpyjournal››The Hokey Ass Message BoardTo start off,yes I did search and couldn't find an answer to the problem I'm having. I read all of the posts and found the proper wiring diagrams for..