There is no such thing as a positve or negative ground battery. there is just a battery.
Ground potential is determined by what battery cable.
N's left the factory s 6v positive ground.
sn is found on the block, left side.. above the starter, aft of the oil can. justunder the seam of the head and block.. it's on a 4" x 1" boss.. it is lightly hand stamped.. all 8n's sn's start with 8n.. all 9n/2n sn's start with 9n.
It's possible to find 9n/2n enines on 8n tractors.. etc.. as the engines are mor eor less interchangeable.. etc...
you'll get more N advice if you actually hang arounf the N forum...
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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