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John Deere Tractors Discussion Forum
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John Deere 60 Ammeter shows negative charge while running

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pmarkel

10-12-2015 18:13:10




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The ammeter on my John Deere 60 reads about -7 to -9 while the tractor is running. Interestingly, when lights are in use, this number is reduced to -4 to -6 (while running) or +3 while tractor is not running. I looked at how the regulator was wired by previous owners. It is a 4 terminal regulator like the one I just installed on 48' B. The previous owner had both the wire to the ammeter (white) and the wire to the light switch (black) on the L terminal of the regulator. The BAT terminal was left unused. I disconnected the battery, rewired the regulator correctly, reconnected the battery, then polarized the gen to the regulator as a precaution. Unfortunately it is still showing a negative charge while running. Has anyone encountered this problem and what are some possible explanations? Thank you.

Sincerely,

Peter Markel

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pmarkel

10-13-2015 16:09:29




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 Re: John Deere 60 Ammeter shows negative charge while runnin in reply to pmarkel, 10-12-2015 18:13:10  
So after switching the battery cables (essentially just turning the battery 180 degrees in the bat box and connecting accordingly) I can polarize the gen to the regulator again and start her up? Do I just polarize the gen the traditional way (touching a wire between the generator armature and the regulator BAT terminal until a spark appears)?



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pmarkel

10-13-2015 09:09:18




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 Re: John Deere 60 Ammeter shows negative charge while runnin in reply to pmarkel, 10-12-2015 18:13:10  
Can I change it back to positive ground without compromising another electrical component on the tractor? Or can I simply switch the white wire from regulator BAT terminal to the other post on the ammeter?



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M-MAN

10-13-2015 10:18:15




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 Re: John Deere 60 Ammeter shows negative charge while runnin in reply to pmarkel, 10-13-2015 09:09:18  
Some voltage regulators will work either way and some won't. If yours does just swap the battery cables and re-polarize the genny. Nothing else cares.



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pmarkel

10-13-2015 09:06:34




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 Re: John Deere 60 Ammeter shows negative charge while runnin in reply to pmarkel, 10-12-2015 18:13:10  
Quoting Removed, click Modern View to see

What would be considered backwards on a 60? If it is backwards, can I simply disconnect the battery, then switch which terminal is feeding the starter and which is grounding it?



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James Howell

10-13-2015 03:45:16




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 Re: John Deere 60 Ammeter shows negative charge while running in reply to pmarkel, 10-12-2015 18:13:10  
"Has anyone encountered this problem and what are some possible explanations?"

Agree with PJH that "it reminds me of an ammeter that is wired backwards."

Take a look at the diagram below.

third party image

Note the white wire from the "BAT" terminal on the REGULATOR to the AMMETER.

Take a look at the diagram below.

third party image

Note the white wire from the "BAT" terminal on the REGULATOR to the negative " - " terminal on the AMMETER.

Hope this helps.

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PJH

10-12-2015 19:50:38




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 Re: John Deere 60 Ammeter shows negative charge while running in reply to pmarkel, 10-12-2015 18:13:10  
Peter - I didn't understand your description of the wiring on your tractor, but it reminds me of an ammeter that is wired backwards. Changing a tractor to negative ground without switching the ammeter leads will get results like you're experiencing.



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Ray

10-12-2015 19:00:33




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 Re: John Deere 60 Ammeter shows negative charge while running in reply to pmarkel, 10-12-2015 18:13:10  
Is the battery in backwards?



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