Harbor Freight Tools


In-Line Spark Checker

Check your ignition system with this ignition spark tester

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OEM 25227 at $7.49 Save 47%

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Product Overview

Use this ignition spark tester to check the condition of the ignition system at each cylinder. The spark tester connects between the spark plug and spark plug wire to troubleshoot dirty spark plug connections, defective points and bad cables or connections. Connects in seconds.

  • Troubleshoot dirty spark plug connections, defective points, bad cables or connections
  • Bulb flashes to indicate ignition or fuel delivery problem
  • Connects between spark plug and plug wire
  • Works on all ignition systems with non-recessed spark plugs including distributorless ignition systems (d.i.s)

Important Information

  • This item is subject to a 20% restocking fee


63590, 4424, 69014, 63846
Product Weight
0.11 lb.
Shipping Weight
0.20 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.