That "single wire" alternator output wires up to the Load (NOT battery/starter) side of the ammeter, the same terminal that feeds battery voltage to loads such as lights and ignition etc. The other Supply side of the ammeter gets to the batterys hot ungrounded post, often by a wire down to where the big battery cable attaches to the start switch/solenoid. Often then theres ONLY ONE wire on the ammeters Supply side (to battery/starter) and maybe two (Alternator and wire to light/ign switch) on the Load side....
If all is wired right yet it drastically continiues to overcharge (keeps battery at say 15 volts all the time) Id say the Voltage Regulator is bad and that will cook the battery...
On the 10SI 3 wire units that one small terminal was used to sense battery voltage, maybe the alternator isnt sensing true battery voltage
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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