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02-09-2023, 09:18 PM | #1 |
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Join Date: Nov 2011
Location: Arkansas & Alaska
Posts: 648
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Amp. meter replacement
Just bought a new amp meter and replaced it with the wiring same as on the old amp guage but shows discharge. I switched poles with the wires and now shows charge. I had it wired exactly the way the books show the wiring diagram. Now it is the reverse but works right. Has anyone else had this problem?
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02-09-2023, 09:50 PM | #2 |
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Join Date: Jun 2019
Posts: 131
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Re: Amp. meter replacement
Seems like I had the same issue. Just reversed sides and it worked OK. Probably just
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02-10-2023, 08:21 AM | #3 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,466
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Re: Amp. meter replacement
Connecting the amp meter is problematic in the way a lot of the diagrams were drawn. It's clear as mud on most of them.
Amp meters have a charge side and a discharge side. The terminals on the back correspond to charge and discharge. They aren't marked on the back so a person only needs to know the relationship between charge and discharge. Illustrations sometimes don't get the point across since the person interpreting the illustration can't tell which side the wire circuit is connected to. Is it the front or is it the back of the instrument? The battery is the component that represents discharge since any current draw comes out of the battery. The generator represents charge since that is the component that charges the battery. This is how they should be connected. |
02-10-2023, 09:03 AM | #4 |
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Join Date: Mar 2017
Location: Connecticut Shoreline
Posts: 1,829
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Re: Amp. meter replacement
Years ago I had the same issue. Did the same thing you did. Has now been working fine for over 20 years.
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02-10-2023, 09:09 AM | #5 |
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Join Date: Feb 2013
Location: New Brunswick, Canada
Posts: 480
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Re: Amp. meter replacement
Common issue. Many ammeters seem to be designed for negative ground systems and since the Model A is normally positive ground, these ammeters must be hooked up "backwards" to properly reflect charge and discharge.
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02-10-2023, 11:53 AM | #6 |
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Join Date: Jun 2010
Location: San Antonio, Texas
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Re: Amp. meter replacement
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The 6-volt converted alternators, usually the GM 10si, have an internal jumper to make them positive ground units. If a person goes 12-volt negative ground then the ammeter wires have to be reversed. Later Fords with the inductive meters will require that the main power lead be reversed through the loop if polarity is changed. |
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