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Lisle spark tester will test spark plugs, wires and coils without puncturing the wire. With the engine running, place the grooved end of the tool over the plug wire, the bulb will flash to indicate spark.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.