Quote Originally Posted by vt_maverick View Post
Now you're over my head...
Well, a lot of people do this I think. I don't personally know the specifics either, but basically you have two batteries. One is connected to your alternator like normal and then the other is connected to the main battery with an isolator or solenoid or heavy duty relay in between. All of their accessories (winch, lights, insane audio system) run off the 2nd battery. The 2nd battery charges while the vehicle is running but is disconnected when the vehicle is shut off. So if you run your lights with the truck off, then you don't drain the main battery. You can also use it for start power redundancy, which is what is most important to me.

I would love to know more about how to do this.

Bart