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Tractor Talk Discussion Forum

Re: Generator wiring without battery?

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Author  [Modern View]
John T

05-03-2013 10:52:19
216.249.82.117



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Like the other sparkies I dont see spinning that 3 brush genny with no load/connections is going to overheat or otherwise trash it. The Field strength absent any field current (no place to flow with FLD post sittin there in open air) is pretty weak (thus low genny output) since the field poles residual magnetism is all you have to work with (as our friend Teddy talks about). With the ARM to GROUND possible output current path also not in use, I dont see the armature as overheating either.

John T

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36 COUPE

05-03-2013 15:50:07
69.49.147.185



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 Re: Generator wiring without battery? in reply to John T, 05-03-2013 10:52:19  
The 3 brush generator does not have a field post.A 3 brush generator will run away to 18 volts without a battery load.



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John T

05-03-2013 17:41:56
72.160.153.158



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 Re: Generator wiring without battery? in reply to 36 COUPE, 05-03-2013 15:50:07  
Typical Class A Generators, 2 or 3 brush, have an external FLD post. It takes a connection from there to a ground source, via a Voltage Regulator or Low/High light switch manual control, to complete the Field circuit. The beginning of the field circuit (first winding) begins at the third brush,,,,,,,,to and through the first coil,,,,,,,to and through the second coil,,,,,,,,to the FLD post,,,,,,,to ground via the VR or switch

Some Class B Generators Ground the field internally and field current is regulated by varying the voltage on its input.

In all my years as a used tractor dealer and many many makes n models of Generators I had to repair grrrrrrrrrr 2 or 3 brush gennys had external Field posts.

Of course, never say never, since there are different types and brands of gennys out there some 3 brush may use an internal ground and NOT have any FLD post, but of the tons I owned and worked on over the years (all different brands)they sure did.

Hope this helps, post back any questions

John T

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JMOR

05-03-2013 18:09:17
72.181.173.171



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 Re: Generator wiring without battery? in reply to John T, 05-03-2013 17:41:56  
Quoting Removed, click Modern View to seeFord, "N" series tractors from 1939 up until 1947 used four different generators having NO Field terminal (only an armature terminal ) & of course ground. Field coils connected to 3rd brush and to ground inside the housing. Used simple cut out, without VR.



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John T

05-03-2013 19:31:11
216.249.82.117



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 Re: Generator wiring without battery? in reply to JMOR, 05-03-2013 18:09:17  
I believe thats correct JMOR, of the ones I recall I think it may have been Fords (maybe a few other oddballs) with no external FLD post and suspect they had the internal grounded Field windings I spoke of above. Of the literal hundred of tractors I bought and sold and repaired gennys FEW WERE DARN FORDS I WAS NOT A FORD MAN LOL It was much more typical to have 3 or 4 brush gennys WITH the FLD post fer sure.

As always, fun chattin with ya, take care now

John T

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JMOR

05-03-2013 20:21:39
72.181.173.171



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 Re: Generator wiring without battery? in reply to John T, 05-03-2013 19:31:11  
You too. Have a nice evening!



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JMOR

05-03-2013 16:52:01
72.181.173.171



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 Re: Generator wiring without battery? in reply to 36 COUPE, 05-03-2013 15:50:07  
Quoting Removed, click Modern View to seeThere are 3 brush generators without a Field post AND there are 3 brush generators with a Field post. His apparently has one as his A-Farmall should. If his did not, then running it with no connection would overpower the fields & perhaps other items & burn it up shortly, but that isn't the generator that he asked about.



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