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Free Ground Shipping on Eligible Orders!
This offer applies to orders shipped within the U.S. to the 48 contiguous states. This offer cannot be combined with any other promotional offer unless otherwise specified and is subject to change without notice. This offer applies to select products that are in stock and shipped from our Burnsville, MN warehouse. Products that do not qualify for free shipping are clearly identified on this website and shipping charges apply to those items. Additionally, we do not ship oversized products outside of the 48 contiguous United States. This offer does not apply to special order items or items which might be shipped directly from the manufacturer. Return shipping costs will be at the customer's expense. If you return a product that qualified for free shipping, the outbound shipping costs will be deducted from your return refund.
Wirthco's new state-of-the-art, fully automatic dual battery controller is suitable for any vehicle with an auxiliary battery. Smaller and lighter than other standard battery isolators, the Battery Doctor 100 amp Battery Isolator employs electronic switching control technology. Wirthco's high-performance electronic isolator allows you to charge two batteries from a single alternator, and keeps the starting battery isolated from the second battery. Also, with a single push of the override/reset button, you can change the batteries to parallel mode for jump starting.
Automatically charges auxiliary battery
Manual override for jump starting
Over-current and surge protected for vehicles with electronic systems
