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06-20-2022, 01:17 PM | #1 |
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Join Date: Sep 2020
Location: Mount Desert, Maine
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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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06-20-2022, 01:34 PM | #2 |
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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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06-20-2022, 01:50 PM | #3 |
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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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06-20-2022, 01:59 PM | #4 |
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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. |
06-20-2022, 03:58 PM | #5 |
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Re: Generator field
It is a cut out set up
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06-21-2022, 08:26 AM | #6 |
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Re: Generator field
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06-21-2022, 10:17 AM | #7 |
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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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