Originally Posted by
mikeo0o0o0
From the factory that's the way it was wired. With the ignition "on" the solenoid for the aux. battery was energized and connected the battery to the electrical system to charge it. When the key was switched "off" the solenoid de-energized and disconected the battery from the system, that way you could run your camper off the auxilliary battery and not worry about running the main battery down.
The auxilliary battery was originally designed to power a camper, not as an additional battery for starting.
Thats how the local electric guy was explaining it to me. So when i have the truck running it is charging the aux battery but nothing is being drawn off it. When i turn it off then its disconnected from the main and lets say i turned on my driving lights or i ran my winch i would be running off the aux battery?
Really what i want to do is never be left with a dead battery anywhere.