When using the spark plug tester, clip the alligator clip to the vehicle ground, the
frame or engine, then start the engine. Starting at the distributor and
working your way to the sparkplug, you put the probe around one of the plug wires and
the light will flash every time the spark plug fires unless the wire is bad then it
will stop flashing.
Performance Tool Spark Plug Wire Tester, Model# W80530

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Buy 24 or more at $8.99 ea.
- Identifies damaged spark plug wires easily.
- Tester flashes in sync with spark plug firing until it runs across a break in wire.
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