Farm Equipment - D15 ammeter

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D15 ammeter

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=175275
Printed Date: 13 Dec 2025 at 10:06pm
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Topic: D15 ammeter

Posted By: Tracy Martin TN
Subject: D15 ammeter
Date Posted: 18 Oct 2020 at 8:35pm

Can a bad ammeter cause a tractor to not charge? Rebuilder says generator and regulator are good. Ammeter always shows discharge. Thanks Tracy

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No greater gift than healthy grandkids!

Replies:

Posted By: Burl
Date Posted: 18 Oct 2020 at 8:43pm

Tracy - Just had what you are going thru ! Took a week to find but , it was a poor ground on reg. Took me forever to find . Hope that fixes it.

Posted By: MACK
Date Posted: 18 Oct 2020 at 10:51pm

yes, a bad ammeter can keep them from charging. MACK

Posted By: Steve in NJ
Date Posted: 19 Oct 2020 at 7:02am

Absolutely. An Ammeter is a flow meter. It needs current running through it in order for it to tell you something. It also feeds current to the VR.

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

Posted By: Tracy Martin TN
Date Posted: 19 Oct 2020 at 8:45am

How can you test an ammeter? Thanks Tracy

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No greater gift than healthy grandkids!

Posted By: Luke114
Date Posted: 19 Oct 2020 at 10:34am

Hook up the ammeter in series with a battery (or charger) and a headlight. Bulb should be bright and show a few amps of draw on the ammeter. You can do this with either 6 or 12 volt.

Or if you have headlights on the tractor, just turn them on when the tractor is not running and look for the needle to bounce down to a small discharge.

Does your needle ever move at all? And you're sure the meter isn't hooked up backwards?

Posted By: Tracy Martin TN
Date Posted: 19 Oct 2020 at 10:40am

Meter is hooked up correctly. This just started a while back. Thanks Tracy

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No greater gift than healthy grandkids!

Posted By: Acdiesel
Date Posted: 19 Oct 2020 at 10:40am

also you could put a jumper wire on the amp meter and a OHM Meter on your battery and see if its charging.

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D19 Diesel,D17 Diesel SER.3
2-D14, 2-D15 SER.II WF/NF
D15 SER.2 DIESEL
D12 SER.I, D10 Ser.II
2-720'S D21 Ser. II

Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)

Posted By: Ted J
Date Posted: 19 Oct 2020 at 4:22pm

I agree, trace where the ground is and clean it real good. Then take the ends off the battery and clean them real good too. I just had the same problem on a CA that was working well and then just one day...........It was the + side as that was my ground. Quick fix.

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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17