Welcome! Please use the navigational links to explore our website.
Company Logo (800) 853-2651 Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Case Tractors Discussion Forum

amp guage with 20 amp on 12 volt system

Welcome Guest, Log in or Register
Joe N/E Tx

02-08-2008 15:19:57

Report to Moderator

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?

[Log in to Reply]   [No Email]
Ken in AZ

02-09-2008 09:24:45

Report to Moderator
 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

[Log in to Reply]  [No Email]
Jon Hagen

02-08-2008 16:01:52

Report to Moderator
 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.

[Log in to Reply]  [No Email]
Joe N/E Tx

02-08-2008 18:00:50

Report to Moderator
 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

[Log in to Reply]  [No Email]

02-08-2008 18:10:14

Report to Moderator
 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

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums

Today's Featured Article - Talk of the Town: Winterizin Engines - To Drain or Not to Drain? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Winter is fast approaching..for a gas tractor should the gas tank be drained and run the engine til the carb is dry or do the gas stabilizer products I've heard of work? (tractor will not be used til spring) any other tips for winterizing?? " ... [Read Article]

Latest Ad: WD45 Allis Chalmers tractor that needs some reassembly or will make a great donor tractor. I have the motor torn down currently and due to life changes, I need to sell. Tractor has Firestone 16.9x28 tires. Good metal,, carb, block, manifold, head, etc. Price is negotiable for cash. Calls only 7am to [More Ads]

Copyright © 1997-2022 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy