Harbor Freight Tools
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Chicago Electric

12v Battery/Alternator Tester

Car battery tester and alternator tester in one tool

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Ironton 37806 at $9.99. Save 30%

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Product Overview

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.

  • Three LED indicators show whether battery condition is strong, normal or weak
  • Three LED indicators show whether alternator output is too high, normal or too low
  • Works on any 12 volt system
  • Compact design for easy storage


66842, 92571
Chicago Electric
Display type
Product Height
1 in.
Product Length
3-3/4 in.
Product Width
2-3/4 in.
Shipping Weight
0.15 lb.
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.