Follow up on my Electronic Ignition Thread
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=176961
Printed Date: 03 Oct 2025 at 8:31pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Follow up on my Electronic Ignition Thread
Posted By: RMD
Subject: Follow up on my Electronic Ignition Thread
Date Posted: 21 Dec 2020 at 6:13pm
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OK, I looked at it some more and it looks like I can get enough access to the timing hole to check the timing. I have a "Sears Best" Craftsman inductive pickup timing light from the late 1970s. Will this work on the 12V positive ground system on my D12? Searching the web, I find that some say this type of light will work OK with the positive ground; some say that I might have to flip the inductive clamp around; some say that I should use an auxiliary battery to power the light; and some say that I should hook the black lead on the negative terminal and the red lead to a ground. Anybody got any experience with this? By the way, my research indicates that some later D10/12 have a timing pointer on the timing cover and a timing mark on the crankshaft pulley. Mine doesn't have this feature.
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Replies:
Posted By: plummerscarin
Date Posted: 21 Dec 2020 at 7:00pm
| I used an auxiliary 12V battery to power mine when checking timing on 6v Cub w/ positive ground |
Posted By: Oldwrench
Date Posted: 21 Dec 2020 at 8:19pm
| Standard procedure in any strobe light is to use a separate battery to power it. The ignition pulse will trigger it. |
Posted By: dualquads
Date Posted: 22 Dec 2020 at 1:44am
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I have owned that exact same model timing light for 50 years. DO NOT reverse the polarity connections to the battery! My original TL was gracefully replaced by Sears with that admonition 49.5 years ago.. |
Posted By: tractorboy
Date Posted: 27 Dec 2020 at 1:07am
I think mine got cooked the same way on my d-17 pos. ground . Was fresh out of the box, and a" high quality harbor freight item" at that !!!!!
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