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Ford 9N, 2N & 8N Discussion Forum
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Positive Ground 6 Volt

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Tmac

04-27-2004 21:07:51




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41-9N
1 wire generator

Manual states it is a Positive ground system.

New tractor to me and I notice that the batt is hooked up with the neg wire going to chasis

starts and runs fine???? does this mean it has been changed to neg ground? Would it run if hooked up backwards?




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Dell (WA)

04-27-2004 23:46:15




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 Re: Positive Ground 6 Volt in reply to Tmac, 04-27-2004 21:07:51  
Tmac..... ....Thats correct, your 1-terminal 3rd brush roundcan cut-out relay came from the factory with 6 VOLT POSITIVE GROUND and some dumb shadetree mechanic don't know the difference.

Interestingly, positive or negative ground yer startermotor ALWAYS turns the same direction. The only thing that semi-cares is yer cut-out relay. It disconnects yer battery from your genny so the genny gutts don't discharge the battery overnite. And that little problem is taken care of by polarizing the cut-out relay.

But you really should care because you can loose upto 40% of your sparkies with incorrect coil polarity with respect to the battery.

And then there's the little minor weirdness of your ammeter. Ammeters don't care, positive or negative ground, they just indicate which way the electrons are flowing. Traditionally, ammeters indicate (+) when charging the battery, wheather positive or negative ground, (+) means charging.

Iff'n ya wanna correct yer 6 volt frontmount 1-wire 3rd brush genny to POSITIVE ground, Re-wire the battery cables and re-polarize the 2-terminal roundcan cut-out relay by arc-sparkin' the 2-terminals with a wire or other handy conductor. I use pliers handle to arc-spark the cut-out relay. ENGINE OFF..... ..respectfully, Dell

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