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Allis Chalmers Discussion Forum
:

Allis Chalmers B Generator mounting

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extremewhitetail

11-24-2021 12:49:28




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Hey Yall
I just purchased a Allis Chalmers B and cant make heads or tails of a few things.

First, the tractor has a starter and a generator. I have seen other Bs with mounting bracket holes or bolts in the block. My tractor has no way to properly mount the generator bracket. Right now its mounted on a homemade bracket that attached to a bolt near the oil pan. Did this model have a special mounting bracket or do I just need to weld two bolts onto the block?

Second, The magneto has five wires coming out of it. Four for the plugs and one for the coil. I thought the mag provides power so a coil isnt needed. What am I missing here.

Thank You

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extremewhitetail

11-25-2021 13:30:59




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
Thanks Aaron! I'm pretty new at this stuff. It sure is fun.



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Aaron SEIA

11-24-2021 18:48:20




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
A mag and no generator would have zero wires to diagram assuming it also has no battery. Even if it had electric start, that's a single cable down to the starter off the battery.

AaronSEIA



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Jim.ME

11-24-2021 15:24:30




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
Quoting Removed, click Modern View to see

The FM mag is shown as one of the mags used in the specs for the B, so yours may be a modified original.



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extremewhitetail

11-24-2021 15:21:03




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
So would anyone have a wiring diagram for a B with a mag and no generator?



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old

11-24-2021 21:18:03




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 15:21:03  
Real hard to say since you don't know how it has been wired up since your not likely to be able to ask the guy who did it



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extremewhitetail

11-24-2021 15:12:05




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
Well that's great news. I'll just rebuild it.



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extremewhitetail

11-24-2021 15:01:33




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
What would have this mag come off of?



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old

11-24-2021 15:05:46




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 15:01:33  
Appears to be the correct mag for that B just some one rigged it to work as a distributor



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extremewhitetail

11-24-2021 14:00:24




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  



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extremewhitetail

11-24-2021 13:59:06




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  



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extremewhitetail

11-24-2021 13:57:25




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
Yes it has a number 4 with another number of 268600



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Jim.ME

11-24-2021 13:52:25




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
There is usually a name and numbers stamped in the side of the mag. Are there any on yours?
This post was edited by Jim.ME on 11/24/2021 at 01:53 pm.



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extremewhitetail

11-24-2021 13:17:54




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
Thank you for the information. Im guessing now the mag thats on it is not the original.



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extremewhitetail

11-24-2021 13:17:44




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
Thank you for the information. Im guessing now the mag thats on it is not the original.



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Ted in NE-OH

11-24-2021 13:14:56




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
You have an early B before Allis Chalmers offered electric start or lights so no need for a generator. The magneto has 5 wires because it was home modified to use an external coil, probably because the original magneto failed.

I like your idea of welding bolt heads to the block. Needs to be carefully done.



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extremewhitetail

11-24-2021 13:14:15




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
I asked a similar question the other day but was still confused about why the magneto has a place for five wires. Yes the coil is a can type coil.



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old

11-24-2021 13:43:15




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 13:14:15  
Probably an IH J-4 mag which will work on the A/C tractor and they have an external wire going to the mag coil which can be removed and hooked to an external coil so the mag can be used as a distributor



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old

11-24-2021 13:07:57




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 Re: Allis Chalmers B Generator mounting in reply to extremewhitetail, 11-24-2021 12:49:28  
Are you saying it has an external round can coil hooked to the mag?? If you are some one set it up to use the mag like a distributor due to a bad coil in the mag



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