3500/14.2= 247 amps 3500/12.6 = 277amps! aren't the 3500 rated at 12.6 Yeah you are correct. I was just doing a general voltage rating. Either way OP look into a bigger alternator, Xs Power under the hood (whatever fits), and a XS Power battery in the trunk (big as you can get). Go from there and see if you need to add more.