Your problem IS the no voltage on the two small terminals. With the ignition key off, whether gasoline engine or diesel, you NEED 12 volts on the two outside terminals of the three terminals. When you turn on the ignition switch to start the engine, again whether gasoline or diesel, you need voltage on ALL THREE terminals for the slternator to work. You only need a diode or resistor in the switch line if the engine is battery ignition as the ignition can be backfed from the alternator causing the engine NOT to die when the ignition switch is turned off. The resistor is rated at 10 ohm 7 1/4 watt normally found in the wiring loom of the GM vehicals that the alternator came on. I have used 10 ohm 10 watt resistor from Radio Shack. The diode is ok to. NOT NEED on a diesel. Find a 70's era automotive repair manuel. Chilton's or Motor's should have a wiring diaghram of the 3 terminal internal regulated Delco alternator in their general repair section on alternators I have used this alternator to retrofit a divers number of machine from generator to alternator: 4 C-II Gleaner combimds, 88 Oliver, MT John Deere, 8n Ford. The 88 Olivar did not have an ignition switch to switch on the altenator so I used a HOBBS switch in the oil pressure line to energize the alternator. No resistor or diode needed.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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