Harbor Freight Tools


12V Alternator/Battery Tester

Not Available Until Feb. 19

Identify battery problems quickly with this alternator/battery tester

Due to popular demand this product is currently out of stock and will not be back in stock until February 19. Order now to reserve your unit.

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IRONTON 37804 at $13.68 Save 71%

Not Expected to Ship Until Feb. 19

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Product Overview

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 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
0.15 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.

Customer Reviews

Based on 396 Reviews

What Customers Like Best


Easy to Use100+

Great Value100+


92% of Customers Would Recommend This Item

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