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Allis Chalmers Discussion Forum
:

1948 AC B wiring

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BIGJOE

08-17-2008 10:07:50




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is a 1948 Allis Chalmers B positive ground or negative ground? I am finishing a restoration started by my grandpa and have no clue if its a negative or positive. Thanks for your time.




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John T

08-17-2008 10:49:46




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 Re: 1948 AC B wiring in reply to BIGJOE, 08-17-2008 10:07:50  
To be safe I would Polarize the Genny BEFORE you start her up.

John T



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old

08-17-2008 10:13:39




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 Re: 1948 AC B wiring in reply to BIGJOE, 08-17-2008 10:07:50  
It came new + ground but if it has been converted to 12 volts its most likely - ground



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BIGJOE

08-17-2008 10:20:44




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 Re: 1948 AC B wiring in reply to old, 08-17-2008 10:13:39  
ok so i am looking at a positive ground tractor i guess. sweet! thanks for the fast reply sir.



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old

08-17-2008 11:34:55




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 Re: 1948 AC B wiring in reply to BIGJOE, 08-17-2008 10:20:44  
Yep till the late 50s, early 60s almost all tractors where + ground if they where 6 volts.



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TOM OWENS

08-18-2008 17:44:48




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 Re: 1948 AC B wiring in reply to old, 08-17-2008 11:34:55  
1947 b only pops and some smoke, but will not start. the F mark and #1 are right. need all the help i can get. thanks,tom



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old

08-18-2008 18:49:28




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 Re: 1948 AC B wiring in reply to TOM OWENS, 08-18-2008 17:44:48  
Mag or distributor?? Hard to help with out more info. If its a mag drop me an e-mail and I'll send you the manual for that mag.



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TOM OWENS

08-18-2008 20:00:00




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 Re: 1948 AC B wiring in reply to old, 08-18-2008 18:49:28  
IT IS A DISTRIBUTOR, ALSO IT IS A C NOT A B. IT IS STILL 6 VOLT,BUT IT HAS POS. GROUND. I DONT THINK THAT IS RIGHT. THANK'S. TOM



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old

08-18-2008 21:18:43




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 Re: 1948 AC B wiring in reply to TOM OWENS, 08-18-2008 20:00:00  
+ ground is as it should be and it was that way when new. Now as far as spark you could have a simple bad switch, bad wires, bad coil, dirty points, cracked cap bad rotor or the insulator going in the side of the distributor could be bad



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