A fully charged 12 volt flooed-lead-acid battery - when it is at its highest capacity - has 2.15 volts per cell. Not 2.09 volts. An absorbed glass matt battery near the same.
A fully discharged 12 volt FLA battery has 1.9 volts per cell.
You check battery voltage at the battery when it's been at rest for awhile. Not right after cranking or charging. Finding a battery reading 11.9 volts right after cranking means little. If you come back 15 minutes later and it still reads 11.9, it's almost completely discharged (or defective).
A healthy 12 volt battery if sized correctly will drop to 9 - 9 1/2 volts when cranking the engine over. If it drops below 9, there is a problem - e.g. a bad battery, bad wiring, bad starter, engine problem, etc.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
... [Read Article]
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