My Account
Shopping Cart

WirthCo 20090 Battery Doctor 75/100 Amp Dual Battery Isolator

Manufacturer

WirthCo

<h3>About WirthCo Engineering</h3><p>With nearly four decades of experience in the automotive aftermarket industry, WirthCo Engineering has established itself as a trusted manufacturer of quality accessories and electrical components. Based in Minneapolis, Minnesota, this engineering-focused company has built its reputation on innovation, holding over 36 patents that reflect a commitment to solving real-world automotive challenges. WirthCo's product philosophy centers on making vehicle maintenance and electrical work easier and safer for professionals and DIY enthusiasts alike.</p><h3>Battery Doctor Brand Excellence</h3><p>WirthCo is perhaps best known for its Battery Doctor® brand, a comprehensive line of electrical accessories designed to help vehicle owners maintain, protect, and monitor their power systems. The Battery Doctor product family includes everything from <a href="/1894-wirthco-battery-disconnect-switches-200143">battery disconnect switches</a> that protect vehicles during storage to sophisticated monitoring systems that track battery health. These solutions are particularly valuable for owners of classic cars, RVs, boats, and seasonal vehicles that require reliable power management.</p><p>The company's expertise extends to complete electrical system protection and maintenance. Their selection of <a href="/1894-wirthco-fuse-2676">fuses</a> and <a href="/1894-wirthco-fuse-blocks-200458">fuse blocks</a> provides essential circuit protection for both OEM replacement and custom electrical installations. Understanding that proper power delivery starts with quality components, WirthCo manufactures <a href="/1894-wirthco-vehicle-battery-2476">vehicle batteries</a> designed to meet the demanding requirements of modern automotive electrical systems.</p><h3>Innovation Meets Practical Design</h3><p>What sets WirthCo apart is their focus on user-friendly design backed by solid engineering. Products like their <a href="/1894-wirthco-multi-purpose-funnel-14561">multi-purpose funnels</a> demonstrate the company's ability to improve even simple maintenance tasks through thoughtful product development. Each WirthCo accessory reflects decades of understanding customer needs in garages, workshops, and on the road.</p><p>Whether you're managing a fleet, maintaining a vintage vehicle collection, or simply looking for reliable electrical components for your daily driver, WirthCo Engineering delivers accessories that combine innovative features with practical functionality. Their continued investment in product development and patent portfolio ensures they remain at the forefront of automotive aftermarket solutions.</p>

Part Number

20090
06/01/2036 6:51 PM
Sale Price

$160.37

In Stock (8)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The WirthCo 20090 Battery Doctor Battery Isolator is a state-of-the-art electronic dual battery controller designed for vehicles, RVs, boats, and equipment with auxiliary battery systems. Rated at 75 amps continuous with 100 amp peak capacity, this microprocessor-controlled isolator allows you to charge two 12-volt batteries from a single alternator while keeping the starting battery isolated from the auxiliary battery.

Key Features:

  • Priority Charging: Ensures the starting battery is fully charged before connecting the auxiliary battery in parallel
  • Manual Override Function: Single push-button allows batteries to be paralleled for jump-starting if the main battery is discharged
  • Water Resistant Design: IP62-rated protection makes it suitable for marine applications
  • Over-Current and Surge Protection: Protects the isolator and vehicle's electronic systems from damage
  • Compact Electronic Design: Smaller and lighter than traditional diode-based isolators using advanced electronic switching control technology
  • Easy Installation: No modifications to existing vehicle wiring required; fits all 12V negative ground systems
  • Includes Mounting Bracket: Complete with hardware for secure installation

The isolator features LED indicators for power and charging status, automatically connecting the auxiliary battery once the starting battery reaches 13.4V and disconnecting when voltage drops below 12.8V. Designed for lead-acid batteries only, this fully automatic system requires batteries of the same nominal voltage. Compact dimensions of approximately 4" x 4" x 2" and lightweight design make installation simple in tight spaces.

Lowest price and S&H around! Prompt responses! Will def buy from again!

I looked around for few months on where to go to purchase JBA headers for my 01 Tundra. I came across Autoplicity and their prices were untouchable. I even called to speak with a sales representative and he gave me a discount code for my purchase. I would highly recommend doing business and plan on doing more business with them.

Great site. Easy to locate items and they have the best prices! I will be using this site for all my custom parts.

Best price I could find on line, shipped really fast. With how low the price is I was worried but everything came fast and it was the correct parts. This place really keeps the cost of racing down.

Hands down the best price on the Magnaflow catback I have seen by more than 20%. They were able to work out the ship-from-manufacturer tracking after a quick phone call. Will definately be recommending these guys to others.

I received my ARP head studs as described and on time with zero problems, and cheaper than anywhere else.Will use again!!!

Best price I could find anywhere. Almost 10% less than my typical sources and the item shipped in less than 24 hrs.<br>

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy