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Ford 9N, 2N & 8N Discussion Forum
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Re: 9n charging troubles

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Old Fossil

09-02-2013 08:02:17
24.1.35.53



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OK, so there is not anything else I need to be aware of or check at this point?




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Bruce (VA)

09-02-2013 08:44:15
24.125.80.178



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 Re: 9n charging troubles in reply to Old Fossil, 09-02-2013 08:02:17  
Nope.

That being said.....if you want to be 100% sure it's bad, pull the generator & the v/r & take both to your local shop. Most of them won't charge for checking both units.



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Old Fossil

09-02-2013 08:58:33
24.1.35.53



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 Re: 9n charging troubles in reply to Bruce (VA), 09-02-2013 08:44:15  
Bruce, Just 8N,s shows 2 V/R's, #10505-B and
10505-C. Which one would be correct for my application?



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Bruce (VA)

09-02-2013 09:34:32
24.125.80.178



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 Re: 9n charging troubles in reply to Old Fossil, 09-02-2013 08:58:33  
The difference between the B model & C model is that the B model was for a frontmount 8N & came w/ a mounting plate. The C model was for a sidemount 8N & didn't need the plate.

The v/r's are the same.

I'd get the B model; save the plate if you don't need it.

All that being said.....

Are you 100% sure you have an A circuit generator? An A circuit v/r won't work on a B circuit generator.

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Old Fossil

09-02-2013 09:43:53
24.1.35.53



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 Re: 9n charging troubles in reply to Bruce (VA), 09-02-2013 09:34:32  
Bruce, my generator has 3 wires coming from it. 1 from terminal marked GND, 1 from terminal marked FLD, and 1 heavier wire from back of gennerator (ARM). Is this the A circuit you referenced?



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Bruce (VA)

09-02-2013 10:32:39
24.125.80.178



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 Re: 9n charging troubles in reply to Old Fossil, 09-02-2013 09:43:53  
I'm not aware of any way to visually tell an A circuit from a B circuit externally. Remove the belt and wires from the generator. Connect a jumper from the field post to ground, then another jumper from the battery to the armature post. If it spins like an electric motor, it is an A circuit.

Or.........

Assuming it is an A circuit & had an A circuit v/r, look at the v/r. An A circuit will have a bias resistor on the bottom of the regulator between the ground and the field tab. The B circuit will have a bias resistor between the field and arm tab.

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Old Fossil

09-13-2013 08:43:08
24.1.35.53



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 Re: 9n charging troubles in reply to Bruce (VA), 09-02-2013 10:32:39  
Bruce, I confirmed that the generator is an A circuit with the motoring test. Ordered and installed a new V/R and still we do not charge. Took the generator and both V/R's to a local shop that rebuilds alternators/starters, etc.. The gentleman put the Generator on his test bench and ran it with 'Negative Ground' and he said it works fine, than hooked it up for 'Positive Ground" and the Ground wire began smokin'.

He admits that he does not work on many old tractor generators, but wondered if it was a rebuilt generator and could it have been internally wired as a negative ground? Is this possible? Could this explain why I have gone through 3 V/R's, or Do I need to go back to square one. ( by the way, we never got to hooking up the generator to the V/R's, as he was certain the Generator was only functioning when in 'Negative Ground' mode. Any and all suggestions will be entertained. Thanks,

Old Fossil

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Bruce (VA)

09-13-2013 12:05:59
24.125.80.178



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 Re: 9n charging troubles in reply to Old Fossil, 09-13-2013 08:43:08  
" Ordered and installed a new V/R and still we do not charge. "

Did you polarize the generator?

" could it have been internally wired as a negative ground? Is this possible?"

As JMOR said, no.

Find another shop.

But first, hook it all back up & polarize the generator before you start it up.



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Old Fossil

09-13-2013 12:18:39
24.1.35.53



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 Re: 9n charging troubles in reply to Bruce (VA), 09-13-2013 12:05:59  
Bruce, thanks, yes I hooked it all back up and did polarize, will be trying JMOR's test in a few minutes, battery is on charger now.



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JMOR

09-13-2013 12:15:00
72.181.173.171



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 Re: 9n charging troubles in reply to Bruce (VA), 09-13-2013 12:05:59  
Quoting Removed, click Modern View to seeJust as a note for Fossil, the connections I show will BOTH polarize the gen & bypass the VR. If that makes it charge, remove jumpers one at a time, while running, to see which if either stops the charging. Expect a decrease but not complete stop of charging.



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JMOR

09-13-2013 10:12:12
72.181.173.171



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 Re: 9n charging troubles in reply to Old Fossil, 09-13-2013 08:43:08  
Quoting Removed, click Modern View to seeHe is correct that he doesn't work on many generators! There is no such animal as "internally wired" as pos or neg ground generator. The ONLY thing that makes a generator output pos or neg is how it was last polarized, which sets the residual magnetism in the pole pieces. Sorry about your generator man. Can you find a good/old generator man?



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Old Fossil

09-02-2013 14:24:32
24.14.246.107



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 Re: 9n charging troubles in reply to Bruce (VA), 09-02-2013 10:32:39  
Quoting Removed, click Modern View to seeI will try the jumper to the generator test tomorrow, Who knows if it's the correct V/R now, because its the 3rd one since I bought the tractor, and back then it was a real 'Frankenstein', what with all the misc. repair jobs over the years. Thanks for all your help.



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Old Fossil

09-02-2013 08:48:01
24.1.35.53



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 Re: 9n charging troubles in reply to Bruce (VA), 09-02-2013 08:44:15  
OK, Thanks.

I'll bite the bullet & order a new V/R.



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