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Ford 9N, 2N & 8N Discussion Forum
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12v pos or neg ground on an 8n ?

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rwt101

09-12-2017 19:29:04




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I have been looking at a lot of videos on u-tube. And some say they hook up the neg to ground when they change over to 12v. One person put a 12v batt in an 8n with a generator and hooked it up with neg ground and started it. Now all that really confuses me. So what is the right way?




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Walston

09-13-2017 11:23:10




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 Re: 12v pos or neg ground on an 8n ? in reply to rwt101, 09-12-2017 19:29:04  
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If you do a conversion to 12V, I suggest doing a negative ground since that is the current standard practice in the auto industry and there is less chance that someone will screw it up in the future, especially when someone jumps it.
For the most part, the tractor doesn't really care.



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HFJ

09-13-2017 09:49:00




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 Re: 12v pos or neg ground on an 8n ? in reply to rwt101, 09-12-2017 19:29:04  
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it will, but only in a good way, as far as i am aware. it will spin faster :)



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rwt101

09-13-2017 09:35:11




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 Re: 12v pos or neg ground on an 8n ? in reply to rwt101, 09-12-2017 19:29:04  
What about the starter. Will it be affected ?



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HFJ

09-13-2017 09:00:08




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 Re: 12v pos or neg ground on an 8n ? in reply to rwt101, 09-12-2017 19:29:04  
well, not quite nothing, den. a fried alternator is still worth one whole dollar at my local scrap yard :)



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Den N Ms

09-13-2017 08:19:57




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 Re: 12v pos or neg ground on an 8n ? in reply to rwt101, 09-12-2017 19:29:04  
RW,Alternators can be ether negative ground(most common) or special positive ground and hooked up ONLY in that configuration.If the polarity of a alternator is crossed it will let the smoke out of it and you will have nothing.



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JMOR

09-12-2017 20:06:46




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 Re: 12v pos or neg ground on an 8n ? in reply to rwt101, 09-12-2017 19:29:04  
No "right way". You can make generators work either way very easily. You can purchase alternators for either pos or neg ground or roll your own either way. With alternators, the by far use is neg ground & that makes them cheaper to buy.



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R Geiger

09-12-2017 19:34:17




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 Re: 12v pos or neg ground on an 8n ? in reply to rwt101, 09-12-2017 19:29:04  
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A 12 volt generator would not care but a 12 volt alternator would. An alternator has to have negative ground. IMHO.



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tractorguy2

09-13-2017 06:55:20




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 Re: 12v pos or neg ground on an 8n ? in reply to R Geiger, 09-12-2017 19:34:17  
You can buy alternators with positive ground. I had one on my 4000.



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