The Pittsburgh 63590 In-Line Ignition Spark Checker is a compact diagnostic tool that quickly identifies ignition system problems. It connects between the spark plug and plug wire to test for dirty spark plug connections, faulty points, bad cables, or weak ignition signals. The built-in bulb flashes to indicate spark presence, helping you pinpoint issues without disassembly. Compatible with most non-recessed spark plug systems, including distributorless ignition setups, this tool is essential for mechanics, DIYers, and small engine techs.
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