If you’ve done everything you can, and you still need more juice, dual batteries are the way to go.  Really think it through, because it ain’t cheap.  Not everyone NEEDS dual batteries, so I hope this article helps you think it through.  I will be covering the install as related to "Big Blue", the Flatwater Overland 1995 Jeep Wrangler YJ.

What does a responsible overland vehicle owner do when they realize that they have more accessory current draw than can be maintained by the alternator and battery?  Well, they can stop adding accessories (yeah, right), or upgrade the vehicle's charging system.  This can be accomplished in several ways, but first let's look at the major components in a charging circuit.

You will see the mantra "No modification happens in a vacuum" often here on Flatwater Overland.  That's because many people who modify their vehicles fail to take into account the second and third order effects of the modifications.  It is rare that you can add or remove something from a modern automobile and not experience consequences of some kind.

Before you begin repairing or modifying your overland vehicle's electrical system, you must understand some basic electrical theory and familiarize yourself with electrical circuit components, principles, and design.  Not understanding these important basics can not only lead to poorly or non-functioning electrical components, but lead to a devastating vehicle fire or personal injury.