I'm in the process of putting an hour meter on my new Ferris WB. It has a pull start motor, so no battery. Using a voltmeter, I found that once the motor is running, a wire running from the ignition switch to the pto control is powered by 12 volts, or really close to it. I tapped into this wire, but the hour meter is not working. Any ideas on another place to hook up the power wire on a mower with no battery?