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Fordson Tractors Discussion Forum

Re: Positive ground or Negative ground on '56 FMD

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Robert Starling

01-02-2005 18:48:40




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This alternator has the internal regulator as well. So, what really determines whether a negative or positive ground is used?? The only other electrical parts are the ammeter and the lights. Thanks for the help so far. Robert




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ron algiere

01-03-2005 16:48:43




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 Re: Positive ground or Negative ground on '56 FMD in reply to Robert Starling, 01-02-2005 18:48:40  
yhe alternator should have one heavy post on the back, that goes direct to the + of the battery. That's it, the other leads on the alt. are for idiot lights and gauges. Bolting it on will take care of the = ground. the alt. is self excite it will start charging at approx. 1500 rpm and then continue to charge once it starts!



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Dell (WA)

01-02-2005 21:02:24




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 Re: Positive ground or Negative ground on '56 FMD in reply to Robert Starling, 01-02-2005 18:48:40  
Robert..... ...the internal guttz of the ALTERNATOR determine wheather positive or negative ground. All common 12 volt alternators with built-in guttz are NEGATIVE GROUND.

Starter don't care, positive or negative ground. Lights don't care, positive or negative ground. Ammeter don't care, ...BUT... you care. Traditionally, charging the battery, ammeter should read (+). Don't matter positive or negative ground. Iff'n the ammeter don't read (+) when charging, just swap the meter leads and it will then read correctly. Simple, eh?..... ...Dell

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Robert Starling

01-04-2005 06:27:56




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 Re: Positive ground or Negative ground on '56 FMD in reply to Dell (WA), 01-02-2005 21:02:24  
Thanks. That is what I thought, but wanted to make sure. I actually found a similar discussion on Oscar's website and it basically said the same thing. Brian actually gives a step by step explanation of how to get everything connected. Thanks Robert.



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