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I have a 1971 JD 4020 and am having issues maintaining the charge on the batteries (the 12 volt system conversion was done several years ago). The alternator and both batteries have checked out sat. I also made sure the battery ground wire was making good contact with the tractor's frame. Does this tractor have a voltage regulator and could that be my problem? Thanks for the assistance!
 

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Welcome to GTT
'71 JD 4020 came from factory with a 12V not 24V electrical system. My guess is alternator or regulator is causing the elect drain.
 

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Could be that it isn't a 1971. If you post or PM your serial number, I'll check it for you.
 

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I have a 1971 JD 4020 and am having issues maintaining the charge on the batteries (the 12 volt system conversion was done several years ago). The alternator and both batteries have checked out sat. I also made sure the battery ground wire was making good contact with the tractor's frame. Does this tractor have a voltage regulator and could that be my problem? Thanks for the assistance!
Did you ever get your charging problem resolved? I had similar with my 1970. Fixed it cheap and works great! Let me know if you need help.
 
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