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Re: 4020 12v/24v system
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Posted by John T on October 19, 2006 at 06:27:56 from (66.244.90.5):
In Reply to: 4020 12v/24v system posted by nickg on October 18, 2006 at 20:14:36:
Nick, youre not the first or last guy whose experienced headaches with that 24 volt system. Basically, the Starter and Generator are two wire isolated from frame ground systems. The two 12 volt batteries are joined in series to form 24 volts, and at the mid tie point where they are joined together, that same point is also bonded to frame ground. However, the starter is across the 2 outermost untied terminals, the + of one battery and - of the other, which feeds it 24 volts INDEPENDANT OF AND ISOLATED FROM FRAME GROUND..... Nowwwww to get 12 volts to operate the lights etc, its still 12 volts from EITHER outermost untied battery post (+ of one - of other) with respect to frame ground, its just that one battery supples 12 volts Negative ground while the other supples 12 volts Positive ground. Those 2 circuits feed up to the light switch and are identified as either A or B circuits and the theory was to balance the loads on the batteries by supplying some lights off the A circuit (one battery) and others off the B circuit (the other battery). The charging system is 24 volts also isolated from frame ground and charges the 24 volts across the outermost two untied battery posts (+ of one battery - of other) charging the series battery combination both at once. It happens inside starters that copper brush dust can cause a shorted connection from one of the batteries to frame ground (its supposed to be totally isolated from frame) which can discharge them and its also difficult to keep the loads balanced causing one battery to have to work harder then the other. When asked about problems with 6 or 12 volt grounded systems like most other tractors we can often help over the net, buttttttttt your system is too complicated to provide as much help not being there armed with a test lamp and meter, sorry........ As far as charging either battery, you still connect + to + and - to - from a 12 volt charger to either battery, its just that you find on one of the batteries has its - tied to frame and the other has its + tied to frame. Thats the inner tie point which makes up the series connection. Still, its 12 volts from either outermost untied battery post to frame ground, which is how n where n why 12 volt lights or other 12 volt loads worked when fed from the A or B circuits fed up to the light switch. Due to unbalances one batery can run down and if either is bad that seriously affects starting operformance as you are experiencing. Its also best if both batteries are equal in rating and age and condition and often BOTH have to be replaced if one is bad cuz the other one would then be weaker as its older. Best wishes John T
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