Harbor Freight Tools


500 Amp Carbon Pile Load Tester

Test 12 volt batteries, alternators, regulators and starters under load

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Product Overview

Use the 500 amp carbon pile load tester to test 12 volt batteries, alternators, regulators and starters by putting a load on the system to simulate working conditions. The device features separate color-coded volt and amp meters.

  • Test complete charging system including alternator, regulator, and battery. Also tests starter motor for excessive draw.
  • For use with 12 volt systems
  • Separate voltage and amperage meters are color-coded for easy reading
  • Heavy duty steel case with powder coat finish
  • Vinyl dipped steel clamps with copper plated jaws
  • Heavy duty 4 gauge solid copper wire

Important Information

  • This is a clearance item.


Starting current (amps)
1000 cold cranking amps
Amperage (amps)
Cable length (ft.)
3 ft.
Product Height
10-1/4 in.
Product Length
5 in.
Product Width
10-1/2 in.
Shipping Weight
8.40 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.

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Easy to Use60

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