Posted by Janicholson on May 30, 2021 at 07:05:15 from (24.240.46.228):
In Reply to: Re: Cub alternator posted by grandpa Love on May 30, 2021 at 06:15:46:
The delco #1 terminal needs 12v to start charging, when it does start charging that #1 terminal is being fed 12v from inside the alternator. So if it is connected directly to the ignition switch the voltage now coming back from the charging alternator #1 terminal will continue supplying enough current to keep the coil operating and the engine will not shut off. So putting a filament type small lightbulb in series with the #1 terminal and the on off switch (on the coil side not supply side) limits the current trying to get to the coil and the engine stops. When it stops, the voltage goes to zero on the #1 terminal, ready for the next startup. Idiot lights on the dash of cars equipped with several different alternators that are wired like the 10SI operate that way. A 10 ohm resistor of 10 watt dissipation will also work, as will a diode in the wire allowing voltage to go to the alternator in #1 terminal, but not back to through the ignition. Other options are also available to initially give the #1 terminal 12v. They include an oil pressure switch that closes at 5 psi turning on 12v to #1 terminal, but shutting it off when oil pressure goes away. or a momentary contact push button that the operator gives a push to give a pulse of 12v to #1 terminal. It does not need continuous 12v once excited. Jim
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