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 - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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