i upgraded my alternator with a 150a Alterstart alternator i got from biju

the install wasnt bad.. i had to raise the vx to articulate the suspension to get the old one out of the fender well.. other than that it was a pain to try to attach a 2/0 gauge wire to the alternator and had to get new battery terminals to support the wire size

ill effects... at idle the high output alternator only puts out 75 amps.. bumps to 150 at 1000 rpms.. made me nervous at first.. ive gotten used to seeing my idle voltage at 12.5 or so.. as soon as i touch the gas it jumps to 13.6-14.4

also my battery indicator lamp on the dash is always lit now because the circuit doesnt like the signal it gets from the alternators regulator (only supplies power when there is a draw, no extra to satisfy the stupid light that the alternator is working properly) so if i were to get my battery/alternator tested at autozone.. they would tell me its faulty.. even though ive driven like 3k miles on it

i believe that you will also need a system to divert power between the two batteries.. i think a PM to biju or spazz is in order