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Ford 9N, 2N & 8N Discussion Forum
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Charging

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Rick

12-04-2003 17:54:15




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Hello All,
Have a question and also want to thank everyone for their input, finally got the neighbotrs tractor to run, found a obstruction inside the carb. My next question is this. The old 8N is converted to a 12 Volt system. It uses a GM 1 Wire alternator. I also put a resister in line as I read that Dell had recommended. My question now is, the Battery was a bit weak when I finally got the tractor to run, kind of ran the battery down when trying to solve the carb problem, now that I have it running again, I see that the ammeter is going to about 20 amps, and once I saw it go as high as about 25. Is this correct, or do I have yet another problem?
Once again, Thanks for all your help and input,
Rick

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Jim Cox

12-05-2003 06:39:37




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 Re: Charging in reply to Rick, 12-04-2003 17:54:15  
you can use a 1-wire alt on a tractor, but the alternator CANNOT be designed for automotive use (highway speeds, highway engine RPMs) You gotta have a stator with better low-end performance, which usually means less total output, kinda like the secondary winding on a transformer, except here we're talking about the Rotor RPM for the primary winding. The CNH 87406907 & 87406908 alternators turn on at about 1/3 throttle on a 9N, but we build them for a MAX of 63A. It's either better low end, or better high end. the only way to get both is to increase the size of the alternator, for bigger stator windings. Look under the hood of a CAT 953 some time. It's about 2 gallons worth of alternator

Jim Cox
CNH Reman ELectrical guy

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uh . . . Dell (WA)

12-04-2003 20:59:54




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 Re: Charging in reply to Rick, 12-04-2003 17:54:15  
Rick..... ....I have NEVER recommended any resistor for ANY 1-WIRE alternator installation, EVER..... UNDERSTAND?????..... ...respectfully, Dell



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Rick

12-04-2003 22:46:42




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 Re: Re: Charging in reply to uh . . . Dell (WA), 12-04-2003 20:59:54  
Hello Dell and All,
I am really sorry I did not explain better. The tractor was recently converted from 6 Volt to 12 Volt and they were still using the ballast resister. I discovered this and after reading many posts, some from Dell, I removed the wiring from the Ballast resister and installed a 1 Ohm resister in line with the Coil. The Coil is a 12 Volt front mount coil as well. This is correct, right?

Thanks,
Rick

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Dell (WA)

12-05-2003 00:50:27




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 Re: Re: Re: Charging in reply to Rick, 12-04-2003 22:46:42  
Rick..... ....ah yes, the 1-wire 12 volt frontmount IGNITION coil. A world of difference from the 1-wire 12 volt alternator.

The modern 12 volt frontmount ignition coil used to include a small strip of paper that suggested for long coil life, connect with a 0.47 ohm 10 watt resistor. But who reads little pieces of toilet paper, eh?

You have it semi-correct. 1.0 ohms is twice as much resistance as you need and will result in lowered sparkies. It'll probably run as is until the sparkplug gap wears wider and then the sparkies gonnna haff problems jumping the gap.

I suggest making your own 1/2 ohm current limiting resistor from 2 (ea) 1.0 ohm 10 watt resistors wired in parallel. RadioShack 2-pack p/n 271-131 will do just fine. Twist the leads together and substitute this "trick" resistor inplace of the "infamous ballast resistor" used for 6 volt frontmount coil..... .....respectfully, Dell.....a 12 volt advocate for the right reasons

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souNdguy

12-04-2003 20:59:01




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 Re: Charging in reply to Rick, 12-04-2003 17:54:15  
As Bob was wondering.. expound a bit more on the resistor. Where did you add it?

Soundguy



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Rick

12-04-2003 22:40:31




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 Re: Re: Charging in reply to souNdguy, 12-04-2003 20:59:01  
Hello All,
I guess I did not explain well enough. The tractor was upgraded to a 12Volt system and I installed a 12Volt front coil on it as well. I read where Dell said to NOT use the balast resister, but rather, put an inline 10hm, 20 Watt resister in line with the coil. Is this correct or not?.
Thanks All,
Rick



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souNdguy

12-05-2003 06:27:11




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 Re: Re: Re: Charging in reply to Rick, 12-04-2003 22:40:31  
That would be a .5 ohm 20 watt resistor made from two 1 ohm resistors twisted to gether in parallel.

They act as a current limiter for the square front mount 12v coil.

Check your values.. if you do indeed have a 10 ohm resistor.. you are loosing some spark power... try the .5 ohm combo instead.

Soundguy



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Bob

12-04-2003 20:42:17




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 Re: Charging in reply to Rick, 12-04-2003 17:54:15  
Why would you put a resistor in-line with a 1-wire alternator?



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old

12-04-2003 18:26:02




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 Re: Charging in reply to Rick, 12-04-2003 17:54:15  
Sounds about right for a low battery but if it keeps doing it for a long time as in hour of runnig you have a problem either a weak/bad battery or a nonworking reg. in the alternator



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BOB

12-04-2003 18:07:54




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 Re: Charging in reply to Rick, 12-04-2003 17:54:15  
Rick sounds like the batt is need of a good charge
and then go from there. if that batt is way down it will charge real high like what you are speaking of. hope this helps

or get one of those batt checker and checks the charging system by hooking the clamps to batt,this is a nice tool to have



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