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!
Ok that makes sense!
Now if i wire it up with a solenoid, then while the trucks running its charging the aux battery but with the truck off the aux battery is disconnected? so if i hook my lights and accesories to the aux battery and it dies, when i start the truck it will start off the main battery and then charge the aux battery?
But lets say i want to listen to my stereo with the truck not running. do i just have the stereo wired to the aux battery?