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Negative ground D-17?

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MarkL

05-21-2003 03:27:35




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Bought a used D-17 (1958) and it runs fine but it doesn't charge. Was going to test regulator as suggested here, but I noticed that the battery negative post is connected to ground, contrary to the manual. Is it possible previous owner mis-connected the battery, and could it still run that way? Could that be causing the charging problem?
Thanks in advance for any help!




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Doug in OR

05-21-2003 06:06:41




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 Re: Negative ground D-17? in reply to MarkL, 05-21-2003 03:27:35  
Actually, changing the polarity is easy on a generator-equipped tractor. Just make the change, then short the BAT and the GEN terminals on the regulator together for a brief moment to repolarize the generator. Also, it is a good idea to check the coil and note if the + terminal is going to the ignition feed wire - usually you need to reverse the coil too. Unless you reverse the ammeter connections, it will show discharge instead of charge, but this won't hurt anything.

Otherwise, check your generator. Disconnect the field terminal and short it to ground. Your voltage on the BAT terminal should increase - way up past 15 volts.

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Gordon-(TN)

05-21-2003 04:28:43




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 Re: Negative ground D-17? in reply to MarkL, 05-21-2003 03:27:35  
your regulator is most likley fried, a alternator
would be your cheapest way to make it work, you can get one for about the same price as a regulator Gordon-(TN)



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steve

05-21-2003 16:04:41




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 Re: Re: Negative ground D-17? in reply to Gordon-(TN), 05-21-2003 04:28:43  
agree,probably the regulator. disconnect the F and G terminals on the generator. ground the F terminal. start tractor and measure voltage across G to F terminals. if you get high volts, the generator is o.k. If you want a wiring diagram, or for an alternator, just ask.



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