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Re: Re: Re: Re: Battery charger hookup
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Posted by Jon H on March 29, 2004 at 10:51:41 from (69.26.17.146):
In Reply to: Re: Re: Re: Battery charger hookup posted by RAB on March 29, 2004 at 06:54:34:
RAB, the 5020 and any other early 24V diesel JD has an odd isolated 24V system with no earth ground connection through the generator or starter case to the tractor. The only place the batteries are grounded to the tractor is at the cable that connects the two 12V batteries together. This allows 12V acessories to be powered from the battery cables at the starter,with one cable being negative earth to the frame,and the other being positive earth to the frame. This is the flaw that made for short battery life with this system. It was nearly impossible to get the 12V accessory load equal on both batteries which led to the lightly loaded one being overcharged constantly and the heavily loaded one undercharged.
It was normal for a set of batteries to last little over a year with the stock system if the 12V accessory load was fairly heavy. The starters and generators also suffered from brush dust causing current leaks to the starter/generator case that would tend to discharge the batteries. Once converted to 12V with one side of the system grounded to the tractor frame,the problems ended. Several that I have converted to 12V now get up to 10 years out of a pair of batteries and the alternators are so much more dependable than the generators. JD realized the 24V system was a bad idea and all 69 and later models were factory equipped with 12V and alternators, JD also sells a factory kit to convert from 24 to 12V. As stated in my post below,there is no problem making an earth ground connection at the starter and frame to charge the batteries.
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