You can eliminate the resistor for the ignition system by using a 12 volt coil but you will still need some way of keeping the #1 terminal of the alternator from back feeding the ignition circuit and preventing the engine from shutting down when the switch is turned off.
This can be done with a diode which stops any current from coming back out of the alternator to the ignition circuit, a resistor which drops the voltage of the back feed too low for the engine to stay running, a light bulb which can serve as a charge indicator and also lowers the voltage, an ignition switch with separate accessory and ignition feed terminals, or a separate source to energize the #1 terminal. A separate source could be a switch that you manually activate to provide the power or it could be done automatically by using a switch closed by engine oil pressure.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
... [Read Article]
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