I got these from the manuals that @ScrapIron posted about a while ago
"Free Basic Shop Manuals"
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Diesel, Single Generator
The diesel single generator system consists of the generator mounted on the top right of the engine. A 110-amp generator with a 2.79:1 pulley ratio is standard. An extra heavy-duty option is available which includes a 140-amp generator with a 2.79:1 pulley ratio. The generators are similar in appearance and use the same connectors, making them interchangeable. Identification between the different generators can be carried out by referring to the generator engineering number and the parts catalog.
In the diesel single generator system, with the key in the ON position, voltage is supplied through the charging system warning indicator (in the Instrument Cluster (IC)) through the I circuit to the voltage regulator. The regulator grounds this circuit and the charging system warning indicator is illuminated. When the engine is started, the regulator removes the ground on this circuit and the charging system warning indicator turns off.
You should have the power cable and connector for the two other wires go to Connector 1104A
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There are plenty of pin point test listed in the manual, but I would check to make sure the I circuit return Pin 1 was not shorted out to ground. I would also make sure that Pin 3 reads the is the return voltage from battery or power distribution.