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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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