Originally Posted by
78_f150
so if i wire up a battery isolator and my main battery dies then it will automatically draw off the aux battery and start up?
No...you will have to use a set of jumper cables from the aux battery to the dead battery. That's the whole point. A discharge on the main battery will not kill the aux, and vice versa. The isolator will make it seem like you have two separate batteries, but they will both stay charged. Cool!