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Ford Charging System

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jon blue

08-30-2005 10:59:57

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I have a 73 5000 that has stopped charging. The generator light flashes off and on while the tractor is running. I replaced the regulator four years ago because it would not charge. Is there a way to check the voltage from the generator? I took both the wires off but get no voltage between them or from either one to ground.

I noticed that with the tractor running, when I remove the wires from the generator that they will spark, so it would seem that the generator is putting out some voltage.
Thanks for help, jon

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t xgrn

08-30-2005 15:53:17

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Re: Ford Charging System in reply to jon blue, 08-30-2005 10:59:57

Generator theory rusty, but you had to energize the gen with a small current to get the gen to put out. I think the armature (rotor) gets the current and the rotating magnetic field generates current in the stator (field) windings. The more the "priming" current or the faster it (the armature) turns, the more the induced voltage in the field and resultant higher power output.

To recharge the battery you have to put out a voltage higher than it's terminal voltage. That difference divided by the circuit resistance determines the charging current.

If the battery is highly discharged, it's terminal voltage will be low. If the rpm's are high and the gen has adequate go ahead excitation (priming) current, the gen could be damaged by excessive output current.

That's why voltage regulators look at voltage and current to keep the gen from frying it'self.

My 2c.

Mark

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