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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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