This is the isolator that we are using and it is wired in the following fashion.http://files.engineering.com/getfile.aspx?folder=cd14540e-da9f-4a37-ba25-ebe47c082a18&file=pac-200_instructions_072006.pdf
I have approx 1500 watt RMS load in my truck. I have two batteries, one is 80ah and other is 180ah (auxiliary battery). The batteries are isolated with the help of a 150 amp battery isolator. The alternator capacity is 90 amps. Considering that the alternator is giving output 80% of its peak...