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Bruce (VA) 11-01-2009 18:24:11 24.125.26.10 739392 Report to Moderator

1) The cut out is just a switch. When the generator stops charging the battery (battery volts exceed generator volts) or when the engine stops, it opens. 2) Yea, that sounds right. But, I'm not looking at a wiring diagram & don't own a 9N. Just do a search in the archives on wiring diagrams. 3) Technology & materials being what they were in the 30's, that square coil would melt if it ran on much more than 4 amps for any length of time. (see tip # 38 for an example). In order to get a hot spark at the same time the starter was drawing max current from the battery, a ballast resistor was added in the ignition circuit. What that did was add about .3 ohms of resistance in the circuit, added to the 1.5 ohms of the coil. That got you 3.5 amps or so at start up. As the voltage increased when the engine was running to about 7.5 volts, the resistor heated up, adding more resistance in the circuit. 1.0 ohms hot, plus 1.5 ohms of the coil got you down to 3 amps or so to keep from melting the coil. 4) Yep, that's right. The thumb starter switch is there to prevent the tractor from starting in gear. The key switch just allows battery voltage to the coil for the ignition circuit. And, if you run the headlights through the key switch, you will melt the key switch. 50 Tips [Reply]   [Send Email]