Originally posted by 93ex
To keep it charged, use a battery isolator or a diode, even tho a diode loses .5 volts or so.
dont wire battery to battery, that will just drain both.
Word! Beat me to it.
I'm also curious why the need for a second battery.. Even some of the most advanced or power-hungry setups can be done on a single battery. Possible that you may just need a larger alternator?