just cranked up my Tv8, 1951 8ba engine for first time after long 3yr bld. i had a gen shop convert the orig 6vlt gen to 12v, put out 35-40 amps on bench.put it in couple years ago, just now started it up,i polorized the gen by sparking to field pole unhooked from the regulator, still no charge???? it's a new regulator. any sugestions????