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Old 06-20-2022, 01:17 PM   #1
Jacques1960
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Default Generator field

Perhaps it’s just age (mine), but a newly installed generator on the 36 Phaeton initially showed negligible amperage, then built to the correct level over a short time.

Is this due to the need to build an initial field ? Curious
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Old 06-20-2022, 01:34 PM   #2
alchemy
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Default Re: Generator field

Should have polarized the voltage regulator on install, shouldn't you? Does a 36 cutout work differently that a separate voltage regulator?
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Old 06-20-2022, 01:50 PM   #3
35fordtn
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Default Re: Generator field

Typically a Cut Out generator does not need to be polorized. If it was a fresh rebuild likely the brushes are finally seating and wearing in. The 1936 generator has a adjustable brush so you can always easily adjust the output
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Old 06-20-2022, 01:59 PM   #4
tubman
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Default Re: Generator field

You polarize the generator, not the voltage regulator or cut out.

Do we even know if the O/P has a stock cutout or has upgraded to a regulator?

From the sounds of it, he has a regulator.
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Old 06-20-2022, 03:58 PM   #5
Jacques1960
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Default Re: Generator field

It is a cut out set up
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Old 06-21-2022, 08:26 AM   #6
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Default Re: Generator field

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Quote:
Originally Posted by tubman View Post
You polarize the generator, not the voltage regulator or cut out.
I always do my polarizing at the VR. Easier to just take that wire off and touch to the other tab. And if I am replacing the generator, I am probably replacing the VR at the same time. I've got no experience with the early generator and cut outs.
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Old 06-21-2022, 10:17 AM   #7
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Default Re: Generator field

When 6-volt DC amperage is applied to the field coils, it will magnetize the generator pole shoes with enough magnetic Gauss (residual magnetism) to allow the generator to produce a current as soon as it starts to turn after engine start. The output will be enough to pull the cutout switch closed and bring the generator on line with the battery. Once the battery is in the circuit then the voltage output will follow the battery voltage (three brush types).

The diode cut out will essentially do the same thing as the mechanical cut out. To polarize the field a person needs to apply a battery negative terminal to the field wire in the generator with the generator grounded along with the rest of the vehicle or the generator case. This will set polarization for positive ground as most of the old Fords are. The third brush is connected to the field coils but gaining access can be complicated depending on the generator type. It's easier to polarize them during overhaul in some cases.

All generators need to be polarized or they won't put out any current. If the generator already had residual magnetism then it may come on line without further polarizing of the field pole shoes. If it comes on line and indicates a current charge then it's good to go.
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