Farm Equipment - Ammeter Issue

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Ammeter Issue

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=173224
Printed Date: 18 Sep 2025 at 8:38am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Ammeter Issue

Posted By: Charlie175
Subject: Ammeter Issue
Date Posted: 31 Jul 2020 at 5:38am

I was operating my 190XT near dark the other evening and turned my lights on. After a few minutes I noticed my ammeter light was getting brighter. As I looked closer the inside "dial" face was melting it seems. I turned off the lights and now the black inside portion of the "face" is crumbled up at the bottom of the gauge.

Is the inside of these plastic? This is the OE AC gauge

Or is it paper?

Tractor is stored inside and has not been in the rain for a long time. But it was a very humid evening.

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Charlie

'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD

Replies:

Posted By: Steve in NJ
Date Posted: 31 Jul 2020 at 6:46am

I would think you could have an overcharging problem due to a Battery starting to sulfate, or the problem could be right at the Ammeter itself. Pull a draw test on the Battery first thing. See if its got a cell going away in it and is putting even a bigger load on the system other than the Headlights. Headlights don't use much power unless you have a grounding problem on the feed side. Like I said, check your power source first, then check Alternator output with a Voltmeter, inspect the Voltage regulator, then inspect to see if the Ammeter has the issue. Something in the system is overheating that Ammeter for some reason, or might be the Ammeter itself... HTH

Steve@B&B

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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife