Posted by Janicholson on June 03, 2011 at 17:09:45 from (67.72.98.45):
In Reply to: Help!!! Cuttman posted by TWheat on June 03, 2011 at 16:14:35:
You didn't hijack anything but an explanation. The oil pressure switch is used on Magneto equipped tractors to excite the alternator when wiring a Hitachi or Delco10SI alternator. The ignition is not involved with a mag, as that is a totally discrete system. On this application, the Diode (when using the oil pressure switch) is not needed, but I was trying to explain an either or situation. The ignition with a distributor could be wired up the same with an oil pressure switch, but the ignition source and a diode, light, or 10 ohm resistor work as well. On a Mag, a separate on off switch is used, in addition to the mag kill switch, to activate the alternator if the oil pressure switch is not used. Even a momentary contact single pole switch can be used to give the alt the signal to charge. Once it is charging, it will stay charging without any more exciting voltage until the tractor is shut off. Jim
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