It would be a lot simpler to upgrade to a large single alternator, maybe a 200 amp capacity, or something similar. Check into adapting your existing mounting system to allow you to install an alternator like a tractor-trailer system would run. It's virtually impossible to have too much amperage capacity, as the battery will only accept enough current to charge itself. Once both battery banks are fully charged, the regulator will cut the alternator back to a minimum charge, no matter what the upper current limit might be. When I ran a diesel shop service truck, I had an 8D series 12 volt battery that weighed about 120 pounds, and a 200-amp brushless alternator. My booster cables were made from 1-0 welder cable and would carry over 1,000 amps. Boost-starting a big rig was no problem!
Jerry
