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12v
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6v coil differences

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MickPB

02-18-2003 21:07:25




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This is a continuation of a message that I posted yesterday that Dell and several others have been helping ne with. To recap I am converting a 2n from 6v to 12v. The kit included a resistor that according to the included diagram is to be wired in front of the ballast resistor. After doing so I get 3.5 v at the coil after everything warms up. I check the new 12v coil the old Ford 6v coil. The 6 volt primary read .7 ohm and the OEM secondary 6600. The 12v coil read 1.1 ohms for the primary and about 8500 ohms for the secondary. So it appears to me the the 12v sticker on the coil was just that a 12v sticker (not a 12v coil). Right?

Thanks for the help on this.

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Danny in CO

02-19-2003 07:39:33




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 Re: 12v - 6v coil differences in reply to MickPB, 02-18-2003 21:07:25  
Mick,

I second everything Dell said. Also, 3.5 volts to a 6 volt coil (with points closed) is just about the perfect voltage. Have you tried to start it yet?

Danny



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MickPB

02-19-2003 12:47:29




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 Re: Re: 12v - 6v coil differences in reply to Danny in CO, 02-19-2003 07:39:33  
Danny,

I haven't tried to start it yet. The whole thing started out as a radiator repair. Scope creep set in and now besides the 12v, the steering box is redone, front pin and bushing, spindle bearing and bushings, compression test, new plug wires, cap rotor and the cast iron is repainted. Serious scope creep but major fun as well. I am amaze at how simple these tractors are to work on. I still need to rebuild the carb and re-finish the hood and fenders before I can try starting it.

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Dave Smith, I know the feeling well

02-19-2003 17:27:43




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 Re: Re: Re: 12v - 6v coil differences in reply to MickPB, 02-19-2003 12:47:29  
If you get to the point you think you should change the air in the tyers. It's time to quit. On second thought I think I want to put new tubes in mine.
Dave <*)))><



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Dell (WA)

02-18-2003 23:30:39




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 Re: 12v - 6v coil differences in reply to MickPB, 02-18-2003 21:07:25  
Mick..... ..I'm glad you're following up on your 12 volt frontmount coil conversion questions. Electrically, theres not a whole lotta difference between your old 6 volt coil and your new 12 volt coil. Your voltage readings with the new 12 volt coil are consistant with 12 volt conversion using the OEM 6 volt coil, mandantory OEM "infamous ballast resistor", and 12 to 6 volt converting resistor. Infact, the secondary of the new coil because of its higher resistance imply more turns and therefore "hotter sparkies". (thats a good thing) I'd use the new coil and plainly label it 6 volts and gettridda that 12 volt lable. Happier 12 volt starting and runnin'.

Oh yeah, with the hotter sparkies, you just might want to seriously consider new copper core sparkie wires with new high quality insulation so your hot sparkies don't leak and cause ruff runnin'..... ..Dell

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Rob - CO

02-19-2003 08:23:47




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 Re: Re: 12v - 6v coil differences in reply to Dell (WA), 02-18-2003 23:30:39  
Dell,

Can the 12V coil and resistor be purchased seperately? If so can you advise.

Thanks



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Dell (WA)

02-19-2003 09:12:17




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 Re: Re: Re: 12v - 6v coil differences in reply to Rob - CO, 02-19-2003 08:23:47  
Rob..... ...yes, there is a "real" 12 volt frontmount coil but Mick does not have one, understand?

And yes, you can purchase a real 12 volt frontmount coil from most N-Ford parts dealers, including Ford/New Holland. Just ask.

DO NOT USE the "infamous ballast resistor" with the new 12 volt frontmount coil, understand? Its the wrong value.

But to make your new 12 volt frontmount coil live a long life, you need a 20 watt 1/2 ohm current limiting resistor that is NOT AVAILABLE from tractor parts dealers. Use my secret trick resistor.

Get a RadioShack p/n 271-131 10 watt 1 ohm resistor 2-pak. Using good electrical techniques, twist and solder the 2 resistor leads side-by-side, and create your own 1/2 ohm 20 watt 12 volt coil current limiting resistor. Install inplace of the infamous ballast resistor. Understand?..... .....Dell, the 12 volt advocate for the right reasons

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Rob - CO

02-19-2003 14:02:26




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 Re: Re: Re: Re: 12v - 6v coil differences in reply to Dell (WA), 02-19-2003 09:12:17  
Thanks Dell.....



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