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1970 3000 diesel wiring and charging

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davidc

05-31-2002 13:54:55




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Finally replaced generator and still seem to be drawing no charge. Have searched archives and found more diagnostic tests to do but have questions. Using my manual I went to trace the wiring diagram. Manual shows a wire going from regulator terminal "B" to the battery. Tractor doesn't show that. Instead it has a wire from "B" going to starter solenoid. There are two wires at the solenoid. ?'s, should the "B" terminal wire go straight to the battery? Did Ford use the same wiring harness for diesel and gas tractors? I have one wire from the harness that appears to go to nothing and judging by the manual it seems it should be going to a coil. I am guessing that doesn't hurt to have it hanging there.
Is the electrical system designed to only have power with tractor running and key switch in the "on" position? Thank you for your help. David

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Texadian

05-31-2002 15:04:16




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 Re: 1970 3000 diesel wiring and charging in reply to davidc, 05-31-2002 13:54:55  
davidc:
1. A new generator may have to be "polarized" to make it start charging the first time. Do this by momentarily connecting a jumper wire between the two terminals on the back of the generator while the engine is idling. 2. The larger terminal on the back of the generator is the "B" - battery or output terminal.
It should connect to the battery positive terminal indirectly through the voltage regulator and the "hot" terminal on the starter solenoid. Diesel and gas charging systems are very similar. 3. A simple test of the charging system is to "full field" the generator. Temporarily install a jumper from the battery positive cable to the small spade terminal (field terminal) on the back of the generator. This bypasses the regulator. If it charges, the generator is OK and there's something wrong with the regulator or wiring. If still doesn't charge there's likely a problem with the generator. The best way to tell if it's charging is to use a voltmeter across the battery terminals. A good battery should have about 12.5 volts. When the generator starts charging you should see over 13 volts. When the battery is fully charged and the voltage is stabilized, You should see about 14 volts.

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