Farm Equipment - ALLIS CHALMERS 1947 B STARTING

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ALLIS CHALMERS 1947 B STARTING

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=136583
Printed Date: 04 Sep 2025 at 3:30pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: ALLIS CHALMERS 1947 B STARTING

Posted By: W3EK
Subject: ALLIS CHALMERS 1947 B STARTING
Date Posted: 25 Mar 2017 at 7:58pm

Getting ready for spring started the 47' "B". Started right up but when I went to shut down with key it would no shut off. Even when removing cable from battery. Tractor has been converted to 12 v with an alternator. Switch or selanoid problem? Any help?
Thanks
W3EK@NETZERO.COM

Replies:

Posted By: Hubert (Ga)engine7
Date Posted: 25 Mar 2017 at 8:26pm

If it still has magneto ignition the switch is not grounding out the mag, either bad switch or broken wire. There should be a tab on the side of the mag to ground it also. The mag could also have a broken wire internally. If it has been converted to battery and coil ignition the alternator will supply voltage to keep it running if the switch is not breaking the connection.

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Just an old country boy saved by the grace of God.

Posted By: Gerald J.
Date Posted: 25 Mar 2017 at 9:59pm

Sounds like the three wire alternator is back feeding the ignition circuit. It takes a lamp, resistor, or diode in that circuit to get it to stop reliably.

Gerald J.