Re: 9N Overcharged??
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Posted by Steamer on August 05, 1998 at 08:01:22:
In Reply to: 9N Overcharged?? posted by Ron on August 05, 1998 at 05:48:09:
: I need some help. : My neighboor, who had borrowed my 1940 9N, ran
: the battery dead and then charged it using a 12 volt
: battery charger. The battery is now charged, but
: the tractor won't start. I suspect the 6 volt
: system was damaged by the 12 volt charger. : Which are the first electrical components that are
: likely to be damaged when charging a 6 volt system
: with 12 volts? I can't seem to locate the problem and
: I thought some of you who are more experienced with
: these things may be able to put me on the right
: track. : Thanks in advance for your help. : Ron Presumably the electrical system was turned off when the 12v charger was connected to the 6v battery. If so, nothing should be damaged on the tractor. However, the battery is likely to be shot. The 12v charger will severely overcharge the 6v battery. That will cause a lot of gassing and heat generation. The water turns into Hydrogen and Oxygen at a prodigious rate. This causes a concentration of acid in the cells. That speeds up the chemical corrosion of the plates. Then, continued charging will build up heat in the cells, causing even more corrosion and mechanical warping of the plates. When you're done - so's the battery! A volt meter will show good open circuit voltage, but as soon as you put the starter load on, the voltage should drop to near zero. This is because the high acid concentration is producing a 'surface charge' on the battery plates. Good voltage, but no current capacity.......
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