• WIRTHCO 20309 Battery Doctor Top Mount Compact Battery Disconnect Switch with 15A Fused Bypass, 500 Surge / 125 Continuous at 12 Volts, Negative Top Post, Green Knob (20309)
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Wirthco

Battery Doctor Top Mount Compact Battery Disconnect Switch with 15A Fused Bypass, 500 Surge / 125 Continuous at 12 Volts, Negative Top Post, Green Knob (20309)

Battery Doctor Top Mount Compact Battery Disconnect Switch with 15A Fused Bypass, 500 Surge / 125 Continuous at 12 Volts, Negative Top Post, Green Knob (20309)

W4820309

$43.99
$43.99
Sale Sold out
Shipping calculated at checkout.

In stock
  • Genuine brand-name parts
  • Ships from US warehouse
  • 30-day returns

The Wirthco 20309 is a battery doctor top mount compact battery. It is a new, genuine Wirthco product with the manufacturer warranty, shipped from the closest US warehouse.

Key features

  • ONE-TURN BATTERY DISCONNECT - Cut power to your vehicle by unscrewing the green knob a few turns to prevent battery drain during storage, then retighten to reconnect without any tools.
  • 15 AMP FUSED BYPASS - Integrated bypass circuit keeps low-draw electronics powered while the main battery is disconnected, maintaining computer settings, radio presets, and clock memory.
  • TOP POST INSTALLATION - Installs directly on the negative battery top post only, and the compact body is sized to fit most battery compartments under the hood.
  • HEAVY-DUTY POWER HANDLING - Rated 500 surge and 125 continuous at 12 volts to handle normal starting and accessory loads on cars, trucks, RVs, boats, and powersports vehicles.
  • THEFT DETERRENT KNOB - The green knob can be unscrewed completely and removed to discourage unauthorized use, and the retail package includes Battery Terminal Markers for clean polarity identification.

Specifications

Brand Wirthco
Manufacturer part number 20309
Part type Electronic Switch
UPC / GTIN 10054203098
Weight 0.50 lb
Dimensions (L × W × H) 0.4 × 0.4 × 0.2 in
Category Electronics & Audio
Condition New — genuine brand-name product
Warranty Manufacturer warranty

Questions

How fast does it ship?

Orders ship from the closest US warehouse, normally within 1–3 business days, with tracking by e-mail.

Is this a genuine Wirthco product?

Yes — new and genuine Wirthco, with the manufacturer warranty.

Can I return it?

Yes. Unused items can be returned within 30 days — see our refund policy for the details.

Shipping & delivery

Orders ship from the distributor warehouse closest to you, normally within 1–3 business days of purchase. Standard ground delivery takes 3–7 business days in the continental US; expedited options are shown at checkout. Oversized items (bumpers, running boards, large tonneau covers, some marine equipment) ship LTL freight — we contact you to schedule delivery and a signature is required.

Returns & warranty

Unused, uninstalled parts in original packaging can be returned within 30 days of delivery. A restocking fee of up to 20% may apply depending on the product and supplier, and return shipping is the buyer’s responsibility unless the item arrived defective, damaged or incorrect. Every product carries the full manufacturer warranty. Contact us with your order number to start a return.

Fitment & part numbers

Verify fitment with the manufacturer part number shown above and your vehicle’s year, make, model and trim. If the listing says “Fits select…”, confirm your exact application before ordering. Not sure? Send us your VIN and the part number and we’ll check it for you.

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