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Case Tractors Discussion Forum
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300 case neg or pos ground

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James Byrd

05-04-2004 06:32:10




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This tractor I recieved had the neg bat. cable going to the frame on the tractor, but I read in the message board that all the 6v are pos ground. Any help would be wonderful. Thanks JB




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Dave700 (GA)

05-05-2004 10:31:51




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 Re: 300 case neg or pos ground in reply to James Byrd, 05-04-2004 06:32:10  
Back in the 50s Ford and British cars used positive ground systems. The only real reason had to do with the ignition system. With a positive ground system the electrons are being emmited from the hot center electrode of the spark plug. This allows the system to fire at several kilovolts less then a negative ground system. Less strain on the ignition coil of those days. Todays coils have vastly better dielectrics etc ( and much higher voltage capabilities). Ford changed over in the mid 50s and the British in the late 50s to negative ground systems. The starter motor runs in the same direction regardless of the polarity. If the system was changed the amp meter might read backwards but that is taken care of by reversin thetwo wires on the amp meter. My 1957 311 was 6 volt positive ground and got converted to 12 volt negative ground but no one had ever reversed the amp meter wires. Hope this helps.

Dave

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Jerry W

05-04-2004 19:26:53




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 Re: 300 case neg or pos ground in reply to James Byrd, 05-04-2004 06:32:10  
The only component of an old point ignition type electrical system that is polarity sensitive is the cutout relay/ regulator. Somewhere on your regulator the ground type (+/-)should be identified and then the whole system has to be wired up this way.

Coil should be wired the same way as the battery which is wired the same way as declared on the regulator. If the negative post of your battery goes to ground then the negative post of your coil should go to ground through the points. The coil will fire either way but has more potential wired correctly. It has something to do with the way the primary and secondary windings in the coil collapse when the points ground.

Jerry W

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Gene Dotson

05-04-2004 08:38:37




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 Re: 300 case neg or pos ground in reply to James Byrd, 05-04-2004 06:32:10  
All Rock Island built tractors used positive ground systems regardless of voltage and all racine built tractors used a negative ground. The 300 was built in Rock Island, so will have a positive ground... Gene



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James Byrd

05-04-2004 06:47:11




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 Re: 300 case neg or pos ground in reply to James Byrd, 05-04-2004 06:32:10  
If the you have the neg ground on a pos groung system will it hurt the points, starter, guages ect.



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C. Amick

05-04-2004 09:33:09




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 Re: Re: 300 case neg or pos ground in reply to James Byrd, 05-04-2004 06:47:11  
The needle on the amp gauge will go the wrong direction unless someone has reversed the wires on it. If the generator and voltage regulator are working with it hooked up this way, I would leave it hooked up the way it is. The starter and points shouldn't be affected.



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