Farm Equipment - WD Ammeter

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WD 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=170989
Printed Date: 26 Oct 2025 at 8:32am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: WD Ammeter

Posted By: EPALLIS
Subject: WD Ammeter
Date Posted: 10 May 2020 at 1:03pm

I have a couple silly questions about the WD Ammeter box.

1. I noticed that the box needs to be "in a certain position" so that it charges correctly. I never pull the charger knob out unless it's half way to run the lights. I just let it charge at the 3amp rate. Sometimes though, I need to "touch the box" correctly so that it works (charges). I'm guessing it must need to be grounded correctly to make that happen?

2. I also noticed at the base of the box on the left hand side there is a small hole. Perhaps for a bolt or screw to be attached? Maybe if I did that, I wouldn't have to "touch" the meter box anymore so that it would charge correctly.

Thanks in advance for any assistance!

Replies:

Posted By: Dusty MI
Date Posted: 10 May 2020 at 1:23pm

Yes there is supposed a screw in that hole. I don't remember for sure but I think that it was a machine screw. Maybe an 8 or 10-32. It might have been brass.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"

Posted By: BigGuy1000
Date Posted: 10 May 2020 at 1:40pm

Yes, that ammeter box needs to be grounded, use a short #8 machine screw, lockwasher, and nut tight in that hole to ground it. But first use emery cloth or sandpaper on both sides of the hole to remove rust and paint. Do not use a sheet metal screw there! How do I know!!!

Posted By: WF owner
Date Posted: 10 May 2020 at 2:27pm

It sounds like it doesn't have a good ground.

Have you thought about replacing the cut out with a voltage regulator? I changed one od my WD45's and I will eventually change all the ones that I have that are 6 volt.

Posted By: EPALLIS
Date Posted: 19 May 2020 at 9:07pm

Thanks Big Guy 1000. I'll get this done this Memorial Day weekend. I really appreciate your reply and advice. Much appreciated!

Yes, that ammeter box needs to be grounded, use a short #8 machine screw, lockwasher, and nut tight in that hole to ground it. But first use emery cloth or sandpaper on both sides of the hole to remove rust and paint. Do not use a sheet metal screw there! How do I know!!!

Posted By: SteveM C/IL
Date Posted: 19 May 2020 at 9:38pm

The original screw is only about 1/4 in long