Re: Generator Pegs Ammeter!!

Posted by Bob M on January 05, 2007 at 09:56:52 from (151.190.254.108):

In Reply to: Generator Pegs Ammeter!! posted by chadd on January 05, 2007 at 09:01:17:

OK – kinda working backward thru your problem here’s what I think. (I’m presuming the wiring is all correct, the regulator has a good ground, etc...):

1 – The 30 amp discharge after shutdown with the old regulator says the regulator’s cutout contacts are not opening. The regulator is indeed no good – throw it away!

2 – The 30 amp discharge with the new regulator and the engine running says the generator is providing current, but that the generator polarity is reversed. Are you certain you are polarizing correctly? (With all wiring and the battery connected, and everything shut off, momentarily jumper the BAT and GEN terminals at the regulator. You should see a small spark when the jumper makes contact – as soon as you do the generator is polarized….)

3 – The fact the generator/regulator work OK on the test machine when negatively grounded says both parts are functional. But why the guy at the repair shop says it only works on positive grounded is a bit puzzling. (On the test stand and when properly polarized, a generator/regulator SHOULD work equally well both negative and positive ground .)

I figure either the repair shop guy doesn’t know what he’s doing, or possibly the new regulator has a diode in place of the traditional mechanical cutout relay, and the diode is arranged for negative ground. Ie. the regulator works only grounded negative. (If this is true the regulator is should be clearly marked “NEGATIVE GROUND ONLY” or similar)

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Probably your quickest/cheapest solution is to simply reverse the ground polarity on your tractor. All you need do is swap the connections at the ammeter, then reverse the battery cables. (If you are a purist you can also swap the primary connections at the coil but it’s not really necessary)

Good luck, and post back what you find!

Replies:

• Re: Generator Pegs Ammeter!! - typo correction! Bob M 10:03:19 01/05/07 (2)
  • Re: Generator Pegs Ammeter!! - typo correction! chadd 10:16:46 01/05/07 (1)
    • Re: Generator Pegs Ammeter!! - typo correction! Bob M 11:25:35 01/05/07 (0)

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