Sure, you can charge the series combination which equals 12 volts with a 12 volt charger. After all thats what happens if you charge a single 12 volt battery as it has 6 cells in series versus only three in a 6 volt battery.
However, Hugh raised some good points for you. If EITHER battery is defective, so is the series sum of BOTH, so charging separately may provide a clue of such as well as a hydromoter check of all cells in both batteries. Look for proper and similar electrolye levels above the plates in all cells of both batteries and see if any are always low or exhibit a gray or milky off color indicative of a bad cell.
If the levels look good and equal with no off colors and theres no evidence of a battery problem, Id just start with a series charge at 12 volts n see if that cures it n not worry much for now. However if problems persist then Id try seperate charging to see what happesn and look for differences in charge rates and times and levels etc
I agree with Hughes good observations for whatever thats worth. That and a buck may buy a cup of coffee UNLESS at a Yuppy Starbucks which I or most farmer type gents dont frequent anyway.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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