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25% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

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25% Off Select Parts and Accessories
Receive 25% Off Your Online or In-Store Purchase. Use promotional code MMJ25 at checkout to receive discount. Not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included will be displayed in product search results and product detail pages. INCLUDES the following categories: Starters, Alternators, Fuel Pumps, Radiators, Shocks & Struts, Chassis, CV Axles, Batteries, Ignition, Window Motors, Wipers, Appearance Chemicals, Car Wash Accessories, Floor Mats, Lift Equipment, Hand Tools, Headlamps and Bulbs. Excludes the following brands: Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner and BBK Performance. Valid online until 2:59 am EST on 5/1/17.

Free Shipping on Orders Over $50 or in-store pickup

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  • Part #: 20090|
  • SKU: 1148866

5 days after 6 p.m.

    • Allows Multiple Batteries to be Hooked-Up to One Alternator-
    • Eliminates Multiple Battery Drain and Dead Batteries
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WirthCo Engineering Battery Doctor 100 Amp Multiple Battery Isolator

Our new state-of-the-art, fully automatic multiple battery controller is suitable for any vehicle with an auxiliary battery. Smaller and lighter than other standard battery isolators, the Battery Doctor Battery Isolator employs state-of-the-art electronic switching control technology. Our high-performance electronic isolator allows you to charge two or more batteries from a single alternator and keeps the starting battery isolated from the auxiliary batteries. Also, with a single push of the override/reset button, you can change the batteries to parallel mode for jump starting.
  • Allows Multiple Batteries to be Hooked-Up to One Alternator-
  • Eliminates Multiple Battery Drain and Dead Batteries
  • Provides Surge Protection for Vehicles with Electronic Ignition/Management Systems
  • Automatically Charges the Auxiliary Battery(ies)
  • Water Resistant
  • Easy-to-Install: Does Not Require Any Changes to the Vehicle's Existing Wiring