Pulling Forum - MSD box?

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MSD box?

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=209542
Printed Date: 16 Feb 2026 at 11:13pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: MSD box?

Posted By: dgerth
Subject: MSD box?
Date Posted: 30 Dec 2025 at 8:23pm

gentlemen,

I have a 1952 AC/WD pulling tractor with an MSD ignition box. My problem is when I turn the key to the off position when engine is running, there is a 2 or 3 second delay until the engine shuts down. Could this be the box or the key switch or something else? all comments and input welcome.

dgerth

Replies:

Posted By: tbran
Date Posted: 02 Jan 2026 at 2:23pm

We ran into this once years ago - the alternator was back or fore feeding current after the key was turned off. Locate the power wire into the box and remove it - if it dies then what every type of charging system you have might be continuing to supply power to the unit in lowering voltage unit it no longer fires. An electric fan will do the same as when the power is off the DC motor becomes a generator - for a while.

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: HudCo
Date Posted: 03 Jan 2026 at 3:59pm

is their a relay before the ignition box