Jim R said: (quoted from post at 21:57:29 07/30/09) I recently purchased a 1951 Farmall M and when I run it at faster RPM the ammeter pegs out to the Positive side. It is still a 6 volt, positive ground system. There is also a small bracket with a small porcelin piece fastened to the top of the horizontal distributor. This porcelin piece has two wires attached to it, one of which goes to the back of the coil. I"ve never seen a device like this on a "M" and I"m not sure what it is for. Can anyone out there tell me where to start to check to rectify the overcharging problem? Could the voltage regulator possibly be sticking. I"m a little electrically challenged and don"t quite know where to start. Any advise would be greatly appreciated.
Do you know for sure that it is over charging? Pegging the needle may be normal with an alternator. What is the voltage at the battery when the needle is pegged?
What you described on top of the coil is usually a resistor used to drop the voltage so a six volt coil can be used on a twelve volt system.
Does the tractor have an alternator or a generator? If it has an alternator it is possible that the resistor is being used to keep the excite circuit of the regulator from back feeding the primary ignition system so the the engine will shut off with the switch. In that case the power would come from the ignition switch to the coil and then through the resistor to the alternator. If the resistor is just between the ignition switch and the coil, with no wire going to an alternator, then it is part of a twelve volt conversion.
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