I hooked up a voltmeter to the positive ( Center lug on a Spyke coil ) and to the starter ground. It was a "LED" unit that goes through it's self testing cycle when you turn on the ignition. It read correctly as soon as I turned on the key. Immediately, upon start up, it started to cycle through it's self test procedure over and over. I shut it off, checked all my connections ( including ground ) and every thing was OK. I called the vendor. "You can't hook that up to the coil" he says. HUH??? isn't 12 volts 12 volts anywhere? There is no computer on this carburated motorcycle, which I don't think would alter that anyway. The problem was resolved, and to humor "them" I'll hook it up elsewhere, but I don't understand the reasoning behind his statement. Can someone enlighten me please?