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Electricity Leak in Farmall Cub 1955

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Doug

06-08-2004 09:12:40




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Last fall I converted my cub to a 12 volt system. All new wiring, new alternator, lights, battery etc. I now show a discharge on my ameter and my "light" stays on constantly showing no charge. I have checked the wiring and don't see any shorts. Is the next logical step to have the alternator checked?




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Buzzman72

06-09-2004 05:30:55




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 Re: Electricity Leak in Farmall Cub 1955 in reply to Doug, 06-08-2004 09:12:40  
For that electricity that's leaking out, I hope you're using a PLASTIC bucket to catch it instead of a metal one...or, worse yet, letting it run all over the shop floor! ;^)

If, when you did the 12V conversion and went from positive ground to negative ground, you remembered to switch the leads on the back of the alternator...has anybody done any arc welding on the tractor since then? That's a good way to "fry" a diode in the alternator and create a constant discharge...yeah...been there, done that, bought the replacement alternator.

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Doug

06-09-2004 06:04:57




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 Re: Re: Electricity Leak in Farmall Cub 1955 in reply to Buzzman72, 06-09-2004 05:30:55  
You think I'm stupid? Of course I used a plastic bucket, just have to figure out how to get all that electricity back into the battery! No, no welding on the tractor and I know all the leads are correct because it worked fine for 5 months or so. I'm guessing the alternator is bad. Thanks.



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Bob M

06-08-2004 10:53:12




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 Re: Electricity Leak in Farmall Cub 1955 in reply to Doug, 06-08-2004 09:12:40  
Doug – Yeah....assuming the wiring is correct your next step should be to take the alternator in to your local NAPA, Autozone, etc. and have it tested (free!).

If the alternator checks out OK and it’s a Delco 10SI (internally regulated), problem is it’s spinning too slow to “turn on” the internal regulator at startup. Solution is to install a the smallest pulley that will fit on the alternator so it spins faster.

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Doug Ballard

06-08-2004 12:11:57




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 Re: Re: Electricity Leak in Farmall Cub 1955 in reply to Bob M, 06-08-2004 10:53:12  
Thanks for all the tips . . . I'm headed off to the NAPA store for an alternator check.

Doug



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Pa. Pete

06-08-2004 10:29:29




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 Re: Electricity Leak in Farmall Cub 1955 in reply to Doug, 06-08-2004 09:12:40  
Just to be clear, When I said "reverse the leads", I was referring to the connections on the back of the ammeter.



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Pa. Pete

06-08-2004 10:16:28




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 Re: Electricity Leak in Farmall Cub 1955 in reply to Doug, 06-08-2004 09:12:40  
When I bought my Super A, it already had the alternator installed. My ammeter also showed 'discharge'. However, with a multimeter across the battery terminals with the engine running, it was obvious the alternator was doing it's job, as it was reading 13+ volts.
Turns out that the original generator-system had a positive ground, and the alternator-system has a negative ground. My ammeter was working, I just had to reverse the connections. I guess that's what happens with the change in 'ground'.
Hope your fix could be as simple.

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txblu

06-08-2004 09:19:14




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 Re: Electricity Leak in Farmall Cub 1955 in reply to Doug, 06-08-2004 09:12:40  
Depending on where your voltage regulator is your voltage regulator is supposed to cancel the effect of this light with either an open contact (mechanical) or reverse diode (electronic). If you are using one of the GM alternators that contain everything, you may have a shorted diode therein.



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