Harbor Freight Tools


12V Battery/Alternator Tester

Plugs into your cigarette lighter port for easy, accurate vehicle battery testing

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IRONTON 37806 at $9.99 Save 30%

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Plug this tool into the cigarette lighter port to quickly test your vehicle’s charging system. The alternator tester features three LED indicators to show your alternator’s output. The car battery tester also features three LED indicators to indicate strength of your battery’s condition.

  • Plugs into cigarette lighter port for easy, accurate, hassle-free testing
  • 3 LED indicator quickly shows battery and alternator status
  • Compact - stores easily in your glove box

Display type
Product Height
1 in.
Product Length
3-3/4 in.
Product Width
2-3/4 in.
Shipping Weight
0.10 lb.
CA Residents
Warning - Prop 65 Info
Note: Specifications are approximate and subject to change

We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.