Went over to a friends that needed help on his 66 belvedere, blew out the fusable link when he changed the alt. The link blew a new one in still no charge. Seems somehow he blew it when the field wire hit the ground? Any how trouble shooting drove me crazy, the pos wire from the starter relay was still getting 12 volts with the neg off the battery? Turns out the MSD unit stays gharged for a while and backflows the voltage. Drove me crazy. He is getting another alt and we go from there, and yes the regulator was also changed when I was there. He wanted to pay me and I kept refusing so he gave me this to sell!