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04-28-2020, 10:37 AM | #1 |
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Model A ammeter
Did original ammeters measure -20 to + 20 amps ? I’ve seen some that have a 30 amp range. Also, did original ammeters have the Ford script on them ?
Thanks - Jim |
04-28-2020, 10:41 AM | #2 |
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Re: Model A ammeter
The picture in the service manual for Jan 1928 shows 20 discharge to 20 charge and no Ford script
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04-28-2020, 10:48 AM | #3 |
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Re: Model A ammeter
here's the pic .
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04-28-2020, 10:52 AM | #4 |
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Re: Model A ammeter
My understanding is that the generators, as originally set up, should not put out more than 20 amps – if you were getting more than 20 amps you were doing it wrong. So ± 20 amps was the original setup for the ammeter.
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04-28-2020, 10:55 AM | #5 |
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Re: Model A ammeter
The meters were 20 amp. Can't tell you about the logo. These generators shouldn't really be set to put out more than about 12 amps. Many of the junk repro units are 30 amp.
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04-28-2020, 11:29 AM | #6 |
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Re: Model A ammeter
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04-28-2020, 12:32 PM | #7 |
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Re: Model A ammeter
Ammeters in later cars (before 1940) read up to 30 or 40, maybe it's designed for one of those, or for another marque.
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04-28-2020, 01:13 PM | #8 |
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Re: Model A ammeter
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04-29-2020, 09:46 AM | #9 |
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Re: Model A ammeter
The ammeter in the Model A measures battery charge, not generator output.
More than 20A charge means your battery is probably bad and your generator will soon expire, >20A discharge means the stock battery will be depleted very quickly, possible short somewhere. |
04-30-2020, 09:01 AM | #10 |
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Re: Model A ammeter
Like this one?? . . |
04-30-2020, 09:12 AM | #11 |
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Re: Model A ammeter
Model T ammeters had Ford script, A's did not.
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04-30-2020, 09:35 AM | #12 |
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Re: Model A ammeter
The meters in any T or A I have worked on measure the generator output or draw not the battery voltage. If you did see the needle on the negative side with the engine not running, that would mean an draw somewhere such as short, lights on or cutout stuck. To read battery voltage you would need a volt meter hooked up different.
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04-30-2020, 10:29 AM | #13 | ||
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Re: Model A ammeter
Quote:
Quote:
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