If you did the upgrade and your lights begin to dim and voltage starts dropping why not do the easy install of a GM alternator. I have a 100 amp in the 69, the problem as explained to me is that the Chrysler alternators need rpm to supply the battery with juice, with a GM alternator you bring the rpm to 1500 and this turns the switch on inside and its constantly giving you power. 14.5 volts of power....at idle....at 60mph.....at 100mph....

Dont wanna do the GM....slip in a PowerMaster 1xx amp alternator.....I know you people have upgraded from AM radio's to decent stereo systems in your rides. The 4 speakers inside, the subwoofer maybe, run a 1 Farad Cap in the back, some have electric fuel pumps, we are all doing H1/H4 upgrades....I myself am installing H4 Beams later this month, but unlike the typical modification of a relay and wire ( I have done those) I am going with ballasts.

Suddenly that 60amp Chrysler alternator doesnt sound too tough