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 - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
... [Read Article]
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