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Case Tractors Discussion Forum

amp guage with 20 amp on 12 volt system

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Joe N/E Tx

02-08-2008 15:19:57

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I bought an amp guage with CASE logo that shows 20 amp on charge and discharge. The guage on the tractor shows 60 amps both ways. Will the amp guage needle peg out after the engine is started with a 12 volt system?

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Ken in AZ

02-09-2008 09:24:45

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 Re: amp guage with 20 amp on 12 volt system in reply to Joe N/E Tx, 02-08-2008 15:19:57  
The voltage on the ammeter doesn't matter... the gage reads amps not volts. The only time voltage matters on an ammeter if you're on 12 volts and there's a 6 volt backlight on the meter. It'll burn out the backlight.

The issue may be that the alternator puts out more current (amps) than the meter can handle. If you have a 60 amp alternator (many have their output rating stamped in the housing) and you ever need full power out of the alternator such as charging a nearly dead battery, a 20 amp ammeter is going to get hot and possibly fail.

Hope this helps

Ken in AZ

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Jon Hagen

02-08-2008 16:01:52

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 Re: amp guage with 20 amp on 12 volt system in reply to Joe N/E Tx, 02-08-2008 15:19:57  
What does the 60 amp guage read immediatly after a start or when the battery is low ? If the generator/alternator puts out 20 or more amps, then your 20 amp ammeter will peg out.
If you run this 20 amp guage at more than 20 amps for a long period, it may overheat and burn up. most systems will kick the amperage up for a few seconds after an easy start, then quickly taper back to near 0 amps charge.

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Joe N/E Tx

02-08-2008 18:00:50

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 Re: amp guage with 20 amp on 12 volt system in reply to Jon Hagen, 02-08-2008 16:01:52  
It goes to 20 amps or very close for a short time and then just a little above 0 and runs like that. I'm using an alternator. I was wondering if someone was using one of these guages on a 12 v system without problems. Thanks, Joe

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02-08-2008 18:10:14

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 Re: amp guage with 20 amp on 12 volt system in reply to Joe N/E Tx, 02-08-2008 18:00:50  
I ve got a alt on my 900 an thats the way it does goes over to 15 - 20 depending on the battery an then it goes back to normal

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