scott mac

I submitted a thread a few day ago im hoping if i keep SIMPLE i can explain better..79 rx7.. With stock 1980 motor.IM having a problem with the NEW 80 alt. that has a Internal REG ULATOR.I have bypassed the 79 regulator that is mounted on fenderwell but after driving about 20 miles i got back home and it wont restart?SO im now charging the battery that is a newone with little miles on it.Im thinking its not getting charge from this.This the first time i have driven it since getting REULATOR..What should i do now..THanks for your time..Scott