I'm thinking there is some confusion on when this battery voltage is being read. A battery that reads 11.9 volts with no load on it, has not had a heavy load on it for at least a few minutes or so is basically a dead battery and will not crank an engine. Now if you are reading voltage while cranking that is a whole different situation. Anything over about 10.5 volts would be considered good cranking voltage. It boils down to open circuit voltage versus loaded voltage. Like pointed out, 12.6 volts on a battery that has not seen a charger for several hours would be considered as a full charged battery. If it has been on a charger, weather running in a vehicle or separate battery charger , the surface voltage would have to be removed by a light load for a minute or so and then allowed to settle out again. The old lead acid batterys were rated at 2.09 volts per cell,normally just rounded up to 2.1, however, the maintence free batteries will some times run a little higher as they may be lead calcium plates or some derivitive thereof. Next thing is if you have one bad cell that can throw off the total open circuit voltage to give erronous readings. Takes more than some one reading a voltmeter to determine condition, all reading must be interpeted. I have heard good things about the new type of battery testers on the market, but I understand they cost $600 or so for a good one. I use a carbon pile load tester along with good voltmeters and hydrometers for my work.
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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
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