It's a reman'd Alternator rated at 130 amps, feeding 2 or 3 group 27's rated at 115 A/h each. I see that this same case alternator is rated anywhere from 60 to 120 amps. I specifically remember Kragen listing it as a 130 amp alternator when I got it in '04, and its many free life time warranty replacements from '04 to '07 when It seems I finally lucked into a good one.
The third battery is the ( 7 year old) engine battery and almost never sees any depletion besides the starter. I use a manual switch to control decide where the amps flow to/from. Circuit wise, the engine starting battery is furthest away from the alternator, even with my circuit breaker on the doubled 4 awg tripped.
Honestly I've given up on doing anything more to increase output from the alternator. The batteries seem to enjoy whatever blasting quench I, or the voltage regulator in the computer, allow them. I don't really drive very much anyway, and Solar is my main recharging source.
Removing the nearly fully charged engine battery from the alternator circuit does allow 14.5 to be held for longer, usually.
When the alternator is hot, all bets are off. At hot idle( ~ 550 engine rpm), it can't keep up with the lights and blower motor on high.
I have added a heat shield between it and the exhaust manifold, a few CM away. This was good for 5 hot Idle speed amps. I have the parts to make a cold air feed tube to its backside, but .......
