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Discussion Forum
:

Allis B positive ground

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kevin

09-27-2002 14:11:32




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This may be a dumb questiom, but this is our first "orange" tractor--for my 10 year old son. The tractor came with a GM-type (internal regulator), but our service manual says that the electrical system is positive ground. Just wondering how we set up the starter wiring to work with the 12V alternator with what I assume is regular negative ground. Thanks for any help.

Kevin




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John W.

09-29-2002 23:53:16




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 Re: Allis B positive ground in reply to kevin, 09-27-2002 14:11:32  
Kevin; It sounds to me that a single wire delco alternator is on your tractor. I have a C set up that way. My started is the original 6 volt, The positive side cable is connected to the start switch on the starter together with the wire from the alternator, the negitive side of the battery is grounded to the frame. Lights are wired as usual with switch mounted in the amp meter box. I wondered about a 6 volt starter run on 12 volts, so I contacted Williams Electric, a rebuilder here, and was told the windings in the old starter were very heavy and easily able to handle 12 volts, as long as the starter was in good working order otherwise. Hope this helps. John W.

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Greg Ballantyne

09-29-2002 09:03:27




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 Re: Allis B positive ground in reply to kevin, 09-27-2002 14:11:32  
Another thing to consider is puttiong the tractor back to original 6 volt condition.



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Duey (IA)

09-27-2002 16:29:04




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 Re: Allis B positive ground in reply to kevin, 09-27-2002 14:11:32  
Keven,
I have some wire diagrams on my web page that might be of help. Duey



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Kevin

09-27-2002 18:47:30




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 Re: Re: Allis B positive ground in reply to Duey (IA), 09-27-2002 16:29:04  
Duey,

Great wiring diagrams--they'll be a big help. On the hydraulic parts & diagrams I wasn't always sure which tractor model they applied to. Thanks for the info and the efforts.

Kevin



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willie

09-27-2002 16:10:20




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 Re: Allis B positive ground in reply to kevin, 09-27-2002 14:11:32  
Kevin
as your manual says, Allis B's were pos ground as built with 6 v generator. HOWEVER, if it has been changed to 12 v GM alternator, the alternator rules, is now neg ground.
Willie



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kevin

09-27-2002 18:50:52




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 Re: Re: Allis B positive ground in reply to willie, 09-27-2002 16:10:20  
Willie,

Thanks,--guess I was thinking that the starter would reverse rotation with the ground polarity changed to negative.

Kevin



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Don Lc

09-29-2002 05:11:13




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 Re: Re: Re: Allis B positive ground in reply to kevin, 09-27-2002 18:50:52  
The starter will work + or - ......the only thing you want to keep in mind, is the starter was built for 6v....do not crank too long on 12v ,the starter will get hot.....let it cool and try again......



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steve

09-27-2002 20:18:03




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 Re: Re: Re: Allis B positive ground in reply to kevin, 09-27-2002 18:50:52  
the starter will be fine, just spin a little faster. if you have a magneto you are o.k. if it has a distributor and coil (possible changed) then you need to verify the coil is designed for 12 volts, or has a dropping resistor. IF the alternator charges o.k. then you must have the 1 and 2 terminals connected o.k. if the battery runs down, make sure no 1 wire is switched off by a key or toggle switch.

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