Dual Battery Isolator

7 Product Groups
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    Painless Performance Dual Battery Control Systems

    Painless Wiring 250 Amp Waterproof Dual Battery Current Control System
    4.0 4.0 (1)

    From $149.99

    Rugged Ridge Dual Battery Relays

    Rugged Ridge Dual Battery Relay

    From $219.99

    Painless Performance Remote Solenoid Kits

    Painless Wiring Solenoid Kit
    4.0 4.0 (1)

    From $102.99

    Westin T-Max Dual Battery Systems

    Westin T-Max Dual Battery System
    5.0 5.0 (1)

    From $161.99

    Powermaster Battery Isolators

    Powermaster Battery Isolator

    From $139.99

    Warn Dual Battery Control Kits

    Warn Dual Battery Control Kit
    1.0 1.0 (1)

    From $246.99

    Tow Ready Battery Isolation Solenoids

    Tow Ready Battery Isolation Solenoid

    From $17.99

    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.

    9 Products
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    Rugged Ridge Dual Battery Relay Kit - 17265.01

    $219.99

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Painless Wiring 250 AMP Dual Battery Control - 40102

    $159.99

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Painless Wiring 250 AMP Waterproof Dual Battery Control - 40103

    $149.99

    • Fitment: Universal Fit
    • + View More Specs - View Less Specs

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Tow Ready Battery Isolation Solenoid - 118665

    $17.99

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Powermaster Battery Isolator - 904

    $143.99

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Westin T-Max Dual Battery System - 47-3800

    $161.99

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Painless Wiring Replacememt Solenoid - 40112

    $102.99

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Powermaster Battery Isolator - 906

    $139.99

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

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  • Warn ATV / UTV Dual Battery Control Kit - 77977

    $246.99

    • Fitment: Universal Fit
    • + View More Specs - View Less Specs

    Free! Curbside & In-Store Pickup: 4 Wheel Parts Glen Burnie #250 View Other Stores

    When you're that type of off-roading weekend warrior out camping in the wilderness after blazing paths through the rugged terrain, you may also be the type to have a couple extra toys on you. Since your off-roading vehicle has tons of add-ons to make your camping adventure particularly awesome, you might need a little more power than usual to keep the fun going. Don't drain the battery on your Jeep, truck, or SUV trying out your new devices, we've got the dual battery isolator you need or even an entire dual battery isolator kit.

    How it Works
    The battery isolator, also known as a split charge relay, uses your vehicle's power to charge an auxiliary battery and blocks your starting battery from getting drained by your equipment when the engine is turned off. The auxiliary battery isolator will only allow the extra battery to charge at whatever rate the alternator can manage. That is why we have many options to choose from so you can find the best dual battery kit that works for your off-roader. Get a battery isolator kit from Painless Wiring, Rugged Ridge, Tow Ready, Warn, or Westin, or try Powermaster battery isolator. Whatever best suits your needs you can find here at 4 Wheel Parts.

    Low Prices, No Hassle
    At 4 Wheel Parts, we strive to be your one-stop-shop for all your off-roading parts and accessories. Our prices are tough to beat and our deals are even better. Keep an eye out for our sales prices and shop with peace of mind that you are getting the highest quality product from the best names in off-roading. Most of our products qualify for free shipping on orders of $75 or more too, so feel free to get everything you think you need in one shot. Our price match guarantee means that even if you can find your purchase for cheaper from one of our competitors, we will match that if you let us know within 90 days of your purchase. Go pick out your battery isolator or isolator kit today.