No spark
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=165167
Printed Date: 15 May 2024 at 12:27am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: No spark
Posted By: Scooter90
Subject: No spark
Date Posted: 19 Oct 2019 at 12:51pm
I’m trying to get my “new” b started. It was stored outdoors the last year or so. The engine turns freely and it has a new 12v battery. The lights work but I have no spark at the plugs.  The instrument cluster is different than shown in the manual. It has a push / pull switch on the lower right for lights. A three position toggle switch on the lower left of which only two poles have wires, one to a ground and one to the magneto. Whatever was in the middle is missing. Can I bypass this switch somehow to see if that is my problem?
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Replies:
Posted By: Jim.ME
Date Posted: 19 Oct 2019 at 12:59pm
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A mag should either have a tab to ground it out on the side of the mag or a wire going back to a switch to ground it. Make sure the tab is clear of the mag body if it has a tab. In your case unhook the wire from the mag and that will bypass a shorted to ground wire as well as the switch. |
Posted By: Sugarmaker
Date Posted: 19 Oct 2019 at 2:16pm
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Scooter, Welcome! Electricals can be tricky. I wire ever one of mine different so that the next guy will have similar issues as you!:) Your about 60-70 miles west of me. Resize your pictures to about 900 x 720. We will be able yo view them better. Regards, Chris ------------- D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet. |
Posted By: Scooter90
Date Posted: 19 Oct 2019 at 2:44pm
| I disconnected the kill tab so it wasn’t touching anything. Still no spark |
Posted By: Jim.ME
Date Posted: 19 Oct 2019 at 2:56pm
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You posted you have a wire to the mag from a switch and the switch has another to ground. By saying you disconnected the kill tab to you mean the wire connected at the kill tab and a kill tab? As for the switch missing something in the middle it might be that is just the switch someone had available and only used those two posts when they wired it. You can use an ohmmeter or other type continuity tester to check continuity between the switch poles if you unhook the wires from it. |
Posted By: Jim.ME
Date Posted: 19 Oct 2019 at 3:00pm
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Posted By: Scooter90
Date Posted: 19 Oct 2019 at 4:51pm
| Yes, I took the wire off the kill tab on the magneto. Would my next step be to replace the points and condenser? |
Posted By: Jim.ME
Date Posted: 19 Oct 2019 at 5:35pm
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Try starting by just cleaning the point contacts, rotor, and inside of the cap. See what that does. Just FYI in regards to your first post. Your battery and the lights have nothing to do with the magneto. Mags are self contained units, that is why they were common on tractors, and other equipment, started with hand cranks and having no electrical systems at all on them. |
Posted By: Scooter90
Date Posted: 19 Oct 2019 at 6:07pm
| I cleaned the points and rotor. I’ll revisit that and post the images. For now do you think it’s ok to leave the kill switch disconnected and out of the “troubleshooting” loop? |