Wirthco
WirthCo Battery Doctor 21049 Circuit and Spark Plug Tester for 12V to 24V Systems, 8 Inch Body, 45 Lead Wire, Alligator Ground Clip, 3 Metal Probe with Cap (21049)
WirthCo Battery Doctor 21049 Circuit and Spark Plug Tester for 12V to 24V Systems, 8 Inch Body, 45 Lead Wire, Alligator Ground Clip, 3 Metal Probe with Cap (21049)
SKU:W4821049
In stock
Couldn't load pickup availability
- Free shipping on $70+
- Ships from US warehouse
- 30-day returns
The Wirthco 21049 is a battery doctor circuit and spark plug tester.
Key features
- Circuit And Spark Plug Testing: Quickly locates wiring problems including bad connections, faulty or broken wires, and sockets, helping diagnose electrical issues in vehicles, trailers, and powered equipment.
- Clear Light Indicator: The indicator light shines when the battery and circuit are sound; no light appears if there is a short circuit or the battery is low, giving fast pass or fail feedback at the test point.
- 12V To 24V Systems: Works on both 12 volt and 24 volt systems, making it suitable for automotive, marine, RV, powersports, and DIY garage electrical troubleshooting.
- Metal Probe With Cap: Pointed 3 inch metal probe reaches connectors, fuse terminals, and sockets, and the included protective cap keeps the tip covered between uses for safer storage in a toolbox.
- Compact Body With Long Lead: The 8 inch tester body pairs with a full 45 inch lead wire and alligator ground clip, giving reach from a grounded battery post or chassis point to test locations across the vehicle.
Before you order
- Check the group size, terminal layout and cold-cranking amps against your current battery.
- Check the plug type and gap spec your engine calls for.
Specifications
| Brand | Wirthco |
|---|---|
| Manufacturer part number | 21049 |
| Part type | Electric Circuit Testing Device |
| UPC / GTIN | 10054210492 |
| Weight | 0.50 lb |
| Dimensions (L × W × H) | 9.2 × 0.9 × 0.5 in |
| Category | Engine & Drivetrain |
| Condition | New |
| Returns | 30-day returns on unused items |
Questions
Will this fit my vehicle?
Match the part number 21049 to your current part, or send us your VIN and we'll confirm the fit before you order.
What does shipping cost?
Standard shipping is free on orders of $70 or more to the lower 48 states and DC, and $8 below that. Express is $15 at checkout. Orders ship the same business day when placed early in the day, otherwise the next business day; standard delivery takes 3–5 business days. Alaska and Hawaii are charged by weight at checkout.
Can I return it?
Yes — unused items in the original packaging can be returned within 30 days of delivery. A restocking fee may apply; see our refund policy.
Shipping & delivery
Shipping & delivery
Free standard shipping on orders of $70 or more to the lower 48 states and DC; $8 on smaller orders. Express is $15 at checkout; Alaska and Hawaii are charged by weight. Orders ship from the warehouse closest to you — the same business day, or the next business day if ordered late in the day, on a weekend or holiday. Standard delivery takes 3–5 business days. 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
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 return shipping is the buyer’s responsibility unless the item arrived defective, damaged or incorrect. Items marked Final sale can't be returned. If a part fails, contact us with your order number and we'll help with the manufacturer's warranty claim.
Fitment & part numbers
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.
