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Tractor Talk Discussion Board

Re: JD 4020 24v Questions


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Posted by Dan in North Houston on April 09, 2023 at 19:45:36 from (136.244.30.122):

In Reply to: JD 4020 24v Questions posted by cfk on April 09, 2023 at 18:33:57:

I have a 4020 and fought the 24 volt problem for years. I had the old generator replaced with an alternator when I had the tractor in the shop for some other
issues, but still had some intermittent starting problems. Turns out that when I had an alternator installed, it was not wired up properly, but I didn't know
that until I switched it over to 12 volt. But in 24 volt configuration, the batteries must be in balance according to what I've read on this forum over the
years (you will find a lot of old posts about the 24 volt problem). I have no idea how you balance electricity, but I got tired of having a tractor that would
not start reliably. My problem was that the tractor would only start about half the time. Batteries would act like they were dead. When it didn't start, I
would put the battery charger on one side and wait a few minutes. And I never disconnected the cables when I did that. At that point, if it did not start, I
would switch the charger to the other side, give it a few minutes, and then it would start. It was always random as to which side would work. And even though
it acted like the batteries were dead, a few minutes charge and it would fire right up as though the batteries were fully charged. I usually only had to use the
charger for a few minutes. And once I got it started, I didn't shut it down, because the problem was the same whether the tractor was shut off for a minute or a
week. And the batteries would only last about a year or so before they were shot.
I got a complete new wiring harness from Agri-Services (you will see many good reviews on here about them), new 12v starter and alternator. They made a custom
harness, all wires were marked, and the instructions were clear. Now it fires up on the first crank, and I've not had to replace the batteries since doing the
conversion.


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