Posted by Janicholson on March 03, 2020 at 20:10:32 from (24.240.46.228):
In Reply to: Alternator wiring posted by SouthernEagle on March 03, 2020 at 19:46:05:
The alternator you are looking at is a Delco 10SI. If it is a standard alternator,it can operate (kinda) with only one wire hooked up. In your picture, the white short wire should go to terminal #2 in the side slot. The redish wire should go to a voltage source that is powered when the ignition is on, BUT, it needs to be connected in series with a diode, or small light bulb, or 10 ohm resistor. The wire is connected to terminal #1 in that slot. It provides "excite" voltage that starts it charging, but when started, it will then have 12v applied in the alternator. The bulb, diode (with the line facing the alternator to allow volts to go only toward the alt, and resistor, which would also limit the current (only one of these is needed) are used to keep the alt voltage from allowing the engine to keep running with the key off. Many new replacement and rebuilt one wire alternators do not need any extra wires to that slot. All one wire alternators are actually turned on to a limited "pilot" standby setting. They will draw a small amount of battery milliamps, so the three wire is preferred by me and others here. While many feel the tractor is used enough to keep that small parasitic drain irrelevant. Jim
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