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International Automotive Technicians Network
Re: Spark Testers - useless vs useful
Posted to Tool & Equipment Forum on 8/26/2019

I have used an ST-125 for 25 or 30 years, in combination with a regular old test light. This combination has NEVER failed to find a weak coil, high secondary resistance, or voltage leaks to ground on any model of any brand I have ever worked on.

If I have no... Login to read more.