yea the toyota puts out about 90 amps i'm lookin for a new one right now so it might be a diferent make and model alternator . my wire came loose on it and started to ground out and it fried the regulator inside atleast thats what a mechanic buddy told me. but i'll be replacing it soon with another one. the way i have it wired up is both batteries are hooked together but they have a disconnect switch in the middle and i have one big battery running to my alternator .and the other car battery i done away with the little stock battery i have the stock system charging it. now if at anytime i need full power to everything i just flip the switch under the seat and i have the power of both batteries and both charging systems all put together thats about 110 amps with the alternator and stock charging system. now the batteries are a 550cca and a 900cca the 900cca is a marine deep cycle and the 550 is a regular light duty truck battery.i have a 1000 watt inverter i use for my sawsall and it works just fine. i can run it for 30 to 40 minutes with a 50' cord and the batteries just start to drop down to 12v but if i rest a light brick on the peddle and bring it just above idol the batteries never drop and i can run it indefinatly. i might try a diferent size pulley on the next alternator to see if i can get a faster rpm spin at idol. but i like to have plenty of juice if i need it.lol