Ok so how does this work? I have a 90A isolator (before anyone goes there... I am not asking which to buy or get or what to do on that.... as there always seems to be a debate...) my question is I have a 4 post isolator NOCO 90Amp Delcotron (CS) Battery Isolator Guard p/n igd-90-cs can be found on pg 14 of this... http://www.wilpowerbattery.com/pdfs/nococatalog.pdf also the manual here http://www.noco.biz/InstallGuidesPDFFiles/ig%2090,140,200%20delc%20cs%20inst.pdf my setup is going to be this... 2x duralast gold 1000ca batteries in parallel under the hood. they are already there and mounted up... then 2 x huge frickers in the bed for just the winch.... the isolator will charge the 2 duralasts on 1 circuit for the truck and 2 biggins on the other circuit... so with that said.. I can see why there are 4 terminals... 1 wire to set of batteries 1 wire to other set of batteries 1 wire from ign on fusepanel 1 wire from alternator (behind alternator that wire???) my question is that is 4 batteries... the side of the isolators says... batteries - 2 alternators - 1 think im pushing any limits with the 4 batteries on this or is that just a default that they put on stuff like this not thinking people are going to use 4 batteries??? the 1000ca batteries are 110 reserve minuts each.. so that is 220 reserve minutes... the giggies are dumptruck batteries.... 12v... 1300ca each... 395 reserve minutes each!!!!!