You are correct that a fully charged 12 volt lead acid battery will read 12.5-12.7 and if it reads 11.5 it is totally dead for all practical purposes. Even 12v would be consider too low to do much. This is open circuit voltage,no load and no charge having been applied for some time as that will leave a surface voltage. The surface voltage from charging can be removed by applying a load like turning on the lights for 15 seconds or so to get a correct reading.
As far as voltage while cranking, you normally consider about 10.5 volts being minimum for good action.
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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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