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Ford 9N Ballast Resistor 12volt Conversion 1 Wire Alternator

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K-n-L Country F

09-10-2015 08:12:03

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I'm having problems knowing if I am properly wiring up my Ford 9N which has been updated with the 12volt system and 1-wire alternator.
With like most other things we work on, there are TOO MANY diagrams which are different from each other. I have done countless searches by typing in Ford 9N 12volt 1 wire alternator wiring diagram and WOW the variety of results that show up!

I just simply need to know if I need 2 ballast resistors like many of the diagrams show or if I just need 1 ballast resistor like the other diagrams show....and if I only need one resistor, which one is the proper one.

I understand that the resistor(s) are based upon the circuit going to the coil, but why would there be a need for 2 resistors in the same line which is going to the coil? Ok, so they made one of the resistors at a particular ohm rating and the other resistor at a particular ohm rating and thus the 2 resistors being used together in the same line going to the coil would add up to the proper range required for the coil. So why didn't Ford just make one resistor which did the same job?

I uploaded the 2 resistors which I bought from ebay. One is the resistor (A8NN12250B) which is mounted on the inside dash panel facing the engine and has the extra bolt which is for creating a hot-wire junction. The other resistor (8NE10306) is...well I'm waiting for an answer as to where it is supposed to be located. I know that it doesn't have to have a designated place but it would be nice to know where to locate it for originality and convenience, and this resistor is the type that is sealed with a ceramic-like substance.

I rather not have to get a analog ohm meter and then go through the work of testing the circuit and evaluating the results in order to know if I need one or two resistors... it would be much appreciated if someone out there has already gone through this and knows exactly what is the proper way.
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tractorguy2

09-10-2015 21:36:46

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Alternator in reply to K-n-L Country Farms, 09-10-2015 08:12:03

If you have a six volt coil. You need both.

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Dell (WA)

09-10-2015 21:28:19

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Alternator in reply to K-n-L Country Farms, 09-10-2015 08:12:03

K'n'L..... ..just as a follow-up, the weird 4-nipple front mount coil has NO identification as whether it is a OEM 6-volt or new modern 12-volt squarecan coil. You haffta read the coil primary resistance. ...ie... 1-ohm (6-volt) or 3-ohm (12-volt) Just read from the top terminal to enny of the bottom terminals. One will be LOW resistance and the other will be HIGH resistance. Iff'n yer using the 200-ohm range, the HIGH resistance will read INFINITY (lazy 8 on its side) Iff'n yer really curious the HIGH resistance will be somewhere between 2000 and 4000 ohms. It should be intuitively obvious, to read the high resistance, you will have to change the range of yer ohm-meter. One final note, whether its the OEM 6-volt or modern 12-volt, BOTH use the same infamous BALLAST resistor..... .HTH, electrical Dell

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TheOldHokie

09-10-2015 08:27:40

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 08:12:03

Quoting Removed, click Modern View to see

The resistance of the OEM wound wire resistor increases with time shortly after you turn the ignition switch on. That gives you a little "current boost" for easier starting and then settles in at a lower current level once theengine is running.

The second resistor is a fixed value and it is ONLY needed IF the coil is a6V coil. In that case you need addional fixxed resistance to prevent the coil from self destructing due to excessive current flow from the 12V battery

If the coil is a 12V coil it has the additional resistance needed for 12V operation internally and you do not need the secondary external resistor.

So do you have a 12V or 6V coil?

TOH

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K-n-L Country Farms

09-10-2015 08:40:37

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to TheOldHokie, 09-10-2015 08:27:40

TOH said "The resistance of the OEM wound wire resistor increases with time shortly after you turn the ignition switch on. That gives you a little "current boost" for easier starting and then settles in at a lower current level once the engine is running. The second resistor is a fixed value and it is ONLY needed IF the coil is a6V coil. In that case you need addional fixxed resistance to prevent the coil from self destructing due to excessive current flow from the 12V battery If the coil is a 12V coil it has the additional resistance needed for 12V operation internally and you do not need the secondary external resistor. So do you have a 12V or 6V coil?
TOH"

Hi thanks for taking your time to help! I have the coil right here in my hand but can't find any identifying characteristics... doesn't say on it if it is a 6 or a 12 volt. Is there a simple way to distinguish a 6volt from a 12volt coil?

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JMOR

09-10-2015 08:57:24

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 08:40:37

You will need to measure the primary resistance of the coil. If 12v, it will be about 2.5 Ohms and if 6v, it will be about a third of that.

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K-n-L Country Farms

09-10-2015 09:05:38

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to JMOR, 09-10-2015 08:57:24

You will need to measure the primary resistance of the coil. If 12v, it will be about 2.5 Ohms and if 6v, it will be about a third of that.[/quote:551b1af42f]

Ok, can I use a digital multimeter to measure the ohms? Reason I'm asking is because I read other posts here on yesterdays tractors as well as other sites where by people were saying that a analog meter would be the better one to use

I also don't know where I put the tester leads onto the coil....the coil has the post on top where the wire is secured to, then there is the spring-like wire on the underside of the coil, and then there is the flat metal contact on the underside of the coil as well

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TOM N MS

09-10-2015 16:52:22

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 09:05:38

Digital goes crazy and won't work if you need to check anything with the tractor running.....such as checking post to post on your battery to see if the alternator/generator is putting out..

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JMOR

09-10-2015 09:08:51

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 09:05:38

Either will be just fine.

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K-n-L Country Farms

09-10-2015 09:11:11

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to JMOR, 09-10-2015 09:08:51

Either will be just fine.[/quote:4fa71abeb9]

Got the multimeter and coil in my hand and so I just need to know where I put the tester leads onto the coil....the coil has the post on top where the wire is secured to, then there is the spring-like wire on the underside of the coil, and then there is the flat metal contact on the underside of the coil as well

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JMOR

09-10-2015 09:54:44

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 09:11:11

Either will be just fine.[/quote:8d011c66d6]

Got the multimeter and coil in my hand and so I just need to know where I put the tester leads onto the coil....the coil has the post on top where the wire is secured to, then there is the spring-like wire on the underside of the coil, and then there is the flat metal contact on the underside of the coil as well[/quote:8d011c66d6]top screw and spring like wire

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K-n-L Country Farms

09-10-2015 10:15:01

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to JMOR, 09-10-2015 09:54:44

Either will be just fine.[/quote:44396ec68a]

Got the multimeter and coil in my hand and so I just need to know where I put the tester leads onto the coil....the coil has the post on top where the wire is secured to, then there is the spring-like wire on the underside of the coil, and then there is the flat metal contact on the underside of the coil as well[/quote:44396ec68a]top screw and spring like wire[/quote:44396ec68a]

Ok I have 200, 2k, 20k, 200k, 2m, and 20m settings on my craftsman multimeter.
I first tried the 2k setting and it reads .003 and so that didn't seem right and so I then set the multimeter to 200 and it reads 3.5 ohms.
Am I doing this on the right setting and if I am doing this on the right setting, then it looks like actually have a 12volt coil and so only need the one resistor. If I only need the one resistor, do I use the ceramic style resistor (8NE10306) or the other resistor (A8NN12250B) shown in the pictures I uploaded?

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JMOR

09-10-2015 10:18:47

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 10:15:01

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K-n-L Country Farms

09-10-2015 10:31:35

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to JMOR, 09-10-2015 10:18:47

Yes, 200 scale. Press two meter leads together & what do you read? Press/scrape leads against screw & spring wire with some force & see if get smaller reading. Only use the 12250 resistor, not the ceramic.[/quote:abc1502d67]

I contacted the 2 leads together on the 200 setting and it fluctuated between 0.5 and 0.7. With the setting still set at 200, I contacted one lead to the screw and then the other lead to the spring and got 3.5. Is that within normalcy?

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JMOR

09-10-2015 10:36:46

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 10:31:35

I would say yes, as it is difficult to obtain real precise measurements on low resistance devices & coils do vary too.

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K-n-L Country Farms

09-10-2015 10:48:25

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to JMOR, 09-10-2015 10:36:46

I would say yes, as it is difficult to obtain real precise measurements on low resistance devices & coils do vary too.[/quote:2292b8cfad]

Great...I genuinely appreciate your time and info! I can't wait to get this tractor wired back up and get to try out my Danuser/Dearborn post hole digger... me and my wife have been restoring the tractor since May of this year and have had the 9N post hole digger for a couple months and with this being our first tractor of this size, it's a whole new world to explore with what this tractor can and can't do :)
Thanks again and hope you have a great day!

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cwtech

09-11-2015 04:14:13

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Re: Ford 9N Ballast Resistor 12volt Conversion 1 Wire Altern in reply to K-n-L Country Farms, 09-10-2015 10:48:25

Using that post hole digger on a 9N or 2N, is a challenge, unless you have a position-control device such as a Zane Thang.

The hydraulics on these tractors are either up or down, and it is very difficult to keep the auger from digging its way in, beyond where the hydraulics will raise it.

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