I have an old Snapper with a Wisconsin-Robin 2 Cycle engine (W125). I have no spark after lending it ot a neighbor. I'm not blaming him, you can't abuse a coil and break it by cutting grass, it just happened to fail while he was using it. I plan to "cook" it next week when I have time but my question is how to test it with a multi-meter. I am a tech minded person but electrical things are PFM to me. Two wire hook-up, three wire screw-up. Thanks in advance.