B ignition question
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=189900
Printed Date: 25 Aug 2025 at 5:49am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: B ignition question
Posted By: tractorman
Subject: B ignition question
Date Posted: 05 Aug 2022 at 1:17pm
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My ole B is being ornery, it won't shut off with the on / off switch , i have to choke it off. won't start with the switch in but starts when pulled out. then won't shut down when pushed in again . i have a spare switch and it does the same thing. now what to fix that ? could it be both switches, one is brand new . Thanks ------------- Play on 38 B 49 WF , working on D14, D15 B10, Bee 12 B110. use 185 and 190 |
Replies:
Posted By: steve(ill)
Date Posted: 05 Aug 2022 at 1:51pm
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If you have a distributor, the switch is used to CUT OFF THE POWER to the ignition coil... You can check that the switch is doing that... If you have a MAGNETO ... the switch is connected to a wire that is on the terminal on the side of the mag... What the switch does is short the wire ( connect) to GROUND and kill the spark... If your WIRE to the switch is good.......... then YES, your switch is the problem. ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 05 Aug 2022 at 1:54pm
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you can test the system by using a house light switch or toggle switch and connecting it temporary.......... or just take the two wires off the switch and PINCH them together or apart while wearing a glove. ------------- Like them all, but love the "B"s. |
Posted By: Gary
Date Posted: 05 Aug 2022 at 6:58pm
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Have you installed an Alternator along with a 12 volt battery ? G |
Posted By: tractorman
Date Posted: 06 Aug 2022 at 6:06pm
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it is an alternator gm 1 wire, the house switch doesn't work either.I did find i think on the alternator wiring there are 2 wires labeled r 1 and f 2 , i think i have them reversed , r 1 is going to the the terminal labeled bat on the alternator f 2 is going to the the ign switch, it starts and runs this way. does it make any difference ? should i reverse them and see. it seems to run and charge fine, just won't shut off with the switch . ------------- Play on 38 B 49 WF , working on D14, D15 B10, Bee 12 B110. use 185 and 190 |
Posted By: steve(ill)
Date Posted: 06 Aug 2022 at 7:06pm
Yes, it makes a difference.. If you dont shut off the signal to the alternator, it can back feed to the coil and keep firing.. you also need a resistor / diode or idiot light in the #1 line.. i guess you have a distributor ignition ? ------------- Like them all, but love the "B"s. |
Posted By: tractorman
Date Posted: 06 Aug 2022 at 9:29pm
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thank you yes it is a distributor , i will switch the wires tomorrow , if theres no rain they are saying rain, i'll try a light or/esistor as well. ------------- Play on 38 B 49 WF , working on D14, D15 B10, Bee 12 B110. use 185 and 190 |
Posted By: steve(ill)
Date Posted: 06 Aug 2022 at 10:01pm
------------- Like them all, but love the "B"s. |