This simple push-button switch with clip leads can be used on both gas and diesel engines. If you are not sure why your engine does not turn over when you turn the key , it can be used to test if your starter motor is working before looking into the ignition switch or neutral safety switch. It makes doing a one-person compression test possible without having to get in and out of the car.
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A video of this switch in use is included in my V8 compression test video.
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