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520 charging -amps

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DAN

12-05-2001 18:16:05




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When I turn on the switch it will show neg like it should,start motor and it moves further neg amps.I checked generator and got plenty of juice from the regulator to the ampmeter,batt pos gnd,and everything else seems to be hooked up correctly,still shows neg amps.This is not my first tractor but my 1st john deere. Please Help




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Clooney

12-05-2001 18:35:21




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 Re: 520 charging -amps in reply to DAN, 12-05-2001 18:16:05  
Dan, it doesn't sound like it's charging. How much voltage do you have at the battery when it is running at high idle? (should be 13+) Having juice at the regulator doesn't tell you much as it has battery voltage from the battery at all times, even when not running. You might try grounding the (F) post (smaller of the two) on the generator & see if it charges. If it does then you have regulator trouble if not then look at the generator. The usual cause of not charging is stuck brush(s), weak brush springs or dirty commutator. If the generator is charging then look for an incorrectly wired ammeter.

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