Harbor Freight Tools


In-Line Spark Checker

Not Available Until Aug. 25

Check your ignition system with this ignition spark tester

Due to popular demand this product is currently out of stock and will not be back in stock until August 25. Order now to reserve your unit.

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OEM 25227 at $7.49 Save 47%

Not Expected to Ship to You Until Aug. 25. Check Below for Nearby Store Availability

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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.