For any off-roader who enjoys camping and exploring isolated locations, or uses extra amperage equipment like winches or on-board air systems, installing a dual battery isolator kit is essential for making sure you can always start the engine to get where you're going. When you've made your way to clear skies and open country, the last thing you want to worry about is a failed start and a dead battery. Back-ups are useful, but having a dual battery isolator switch installed under the hood means your backup is engaged automatically, so you can focus instead on the beauty and adventure of being off-road.

How It Works
An auxiliary battery isolator works by wiring both batteries parallelly when the engine is running, so that both can charge to a full 12V. When the engine is cut, however, the isolator separates the current flow so that the secondary battery can discharge without affecting the primary battery. This means that when you are using battery power to operate amperage equipment like the radio, headlights, auxiliary lights, winches or air systems, power drains only from the secondary battery. The primary battery, on the other hand, remains charged to ensure a power start to your engine.

All the Necessary Parts
Purchasing a complete dual battery wiring kit makes a DIY installation simple. A full kit, like that made by Rugged Ridge, includes all the parts you need: a dual position switch, positive- and negative-charge battery post clamps, the isolator relay, battery cables, the switch wiring harness and mounting hardware. Isolators and solenoids are also sold individually for industrious off-roaders who prefer to pick and choose their parts. For ATVs and other non-automotive utility vehicles, Warn manufactures a lower amperage dual battery installation kit.

Trust 4 Wheel Parts
Whichever combinations of parts you purchase, you can trust 4 Wheel Parts to supply quality equipment at the lowest prices on the market. With our price-match guarantee, if you find a better price within 90 days of your purchase, let us know and we'll refund you the difference. You're sure to find everything you need in our comprehensive online catalogue, so order your parts today.