On a Delco, one (the #1 marked spade in the edge connector) goes to a switched voltage source (often the key or ignition switch for convenience) usually through a small filament lamp that is displayed on the dash panel. inside the alt. it connects to electronics in the internal voltage regulator. When the key is turned on but not started, the internal regulator acts electronically like a ground, causing the light to shine. When the engine is started, the alternator makes enough residual voltage to cause that terminal to have battery voltage. Because there is voltage on both sides of the filament, the light goes out. The regulator then powers the brushes creating charging. The #2 terminal in that connector is a sensing connection that (should be) connected to the battery Positive terminal or close to it. This causes the regulator to produce the 14.2 or so volts that are regulated. In this install, the #2 wire can be placed at alt output because the charge wiring is short and conducts well allowing adequate regulation. If there is no lamp in the #1 spade connector wiring, it must have a diode or 10 ohm resistor to prevent that terminals run voltage, mentioned above, from causing the ignition to be energized even with the key or switch off. It can provide 4 or 5 amps that would back feed the coil and not let the tractor shut off. The supplied excite voltage does not need to be continuous, so some use a push button to start the alternator charging every time the tractor is started. Some use a oil pressure switch with 2 terminals one hot one to the #1 spade. when there is oil pressure the alternator starts charging. when stopped, the excite voltage goes away. If that alternator is wired in the way shown, the alternator stays in an on-ready-to-charge state and will run down the battery over a short or longer time window. Jim
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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