Harbor Freight Tools


12V Alternator/Battery Tester

Identify battery problems quickly with this alternator/battery tester

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IRONTON 37804 at $13.68 Save 82%

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This alternator/battery tester quickly identifies the source of automotive charging problems, eliminating guesswork and saving time. Determine at a glance whether a weak battery is caused by a faulty alternator or a failing battery. This compact and easy-to-use device includes three alternator readings (strong, normal, low) and three battery readings (good, fair, poor).

  • Three alternator readings: Strong (14v), Normal (13.5v), Low (13v)
  • Three battery readings: Good (12.5v), Fair (12v), Poor (10v)
  • 28 in. leads with alligator clip and test probe

Important Information

  • This is a clearance item.
  • This item is subject to a 20% restocking fee

63592, 46972, 69018
Product Height
5/8 in.
Product Length
4-3/4 in.
Product Weight
0.17 lb.
Product Width
1-1/8 in.
Shipping Weight
0.18 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.