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Tool Talk Discussion Forum

Polarizing a 12 Volt Generator?

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amtrac

09-15-2020 14:48:35




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My BF Avery came out of the factory as 6 volt in 1947 of course. Previous owner converted it to 12 volt. I have verified it has a 12v coil, a 12v regulator and the generator puts out 12v at about 6 amps. Do I need to polarize the generator like a 6 volt system? If so, which poles on the regulator would I jump? The regulator has only three poles, BAT, GEN, and F. My 6volt Cub has a four pole regulator and I jump BAT to GEN. Charges good. Thanks

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buickanddeere

09-16-2020 13:10:55




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-15-2020 14:48:35  
loosen the drive belt and push the cutout contacts together . The generator should spin as a motor and be properly polarized .



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JMOR

09-16-2020 08:52:19




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-15-2020 14:48:35  
Quoting Removed, click Modern View to seeno need to re-do...it will remember



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amtrac

09-16-2020 07:16:54




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-15-2020 14:48:35  
Quoting Removed, click Modern View to seeJohn T, My tractor is neg ground. Don't know if the shop guy tested it on pos or neg grd. So I will polarize it before I start the engine. Now, once a generator is polarized, does it stay that way, say if I had to disconnect the battery, or would I have to polarize it again after reconnecting the battery?



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John T

09-16-2020 09:36:13




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-16-2020 07:16:54  
Great question "Don't know if the shop guy tested it on pos or neg grd. So I will polarize it before I start the engine. Now, once a generator is polarized, does it stay that way, say if I had to disconnect the battery, or would I have to polarize it again after reconnecting the battery?"

Its more common for a shop to have it polarized at NEG then POS ground but it never hurts to be safe and polarize before start up ESPECIALLY IF YOU ARE POS GROUND.

Just sitting idle for a relatively long period or simply disconnecting the battery shouldn't cause the gennys soft iron field poles to loose their residual magnetism and it doesn't need re polarized. I think if it was disassembled with the armature removed it may loose polarity sooner.

John T

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amtrac

09-15-2020 19:13:19




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-15-2020 14:48:35  
Thank you John T. Generator was run on test equipment at an auto electric shop to check voltage and amps. Engine has been out of the tractor since March, re-bored and crank turned. Total rebuild. Now I am getting everything back together. Thanks again. Ron



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John T

09-16-2020 05:02:09




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-15-2020 19:13:19  
You're welcome. Anytime a genny has been in the shop I advise people to be safe go ahead and Polarize BEFORE start up and it wont hurt if its already correctly polarized. The reason I say that is because a shop might have a genny polarized at NEG ground and if your tractor is POS ground it really needs correctly polarized.

John T



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Steve@Advance

09-15-2020 16:32:12




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-15-2020 14:48:35  
If it's running and charging, it doesn't need polarizing.

Best leave well enough alone!



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John T

09-15-2020 16:31:11




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 Re: Polarizing a 12 Volt Generator? in reply to amtrac, 09-15-2020 14:48:35  
To Polarize the Generator you use a jumper wire to momentarily flash jump BAT over to GEN (on either a 3 or 4 terminal VR, on either 6 or 12 volt) and you should get a small spark. If needed do that BEFORE start up. Sounds like you are already polarized but you asked and there's your answer

John T



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