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12 volt round coil for 9N

K

Kurtis D. Davis

New User
I'm looking for advice concerning a cylindrical, round, 12 volt coil which would work on a 9N. In particular, I'd like to find a part number for a Motorcraft or AC Delco, 12V coil. I'm thinking an 8N coil would work, but need to find a generic part number if possible. Thanks for your consideration of this request.
 
(quoted from post at 05:43:15 12/15/14) I'm looking for advice concerning a cylindrical, round, 12 volt coil which would work on a 9N. In particular, I'd like to find a part number for a Motorcraft or AC Delco, 12V coil. I'm thinking an 8N coil would work, but need to find a generic part number if possible. Thanks for your consideration of this request.
Click to expand...

Kurtis. Go to the N board here on YT. One of the members there can give you the NAPA part number for what's commonly referred to as the "round can coil" that doesn't require a resistor in line.

Right here on YT they sell an electronic ignition conversion kit that includes all the parts to include the coil. http://www.yesterdaystractors.com/1...n-Conversion-Kit-12V-Negative-Ground_4945.htm

I didn't do the coil conversion but I've very happy with the IE conversion.

Rick
 

NAPA IC14SB... IC14 should be a generic #... IC (ignition coil) 14 (Ratted at 14V's) B (cheaper line of ignition products $15/20)..

You can also use a IC64 $40 are so :shock:
 
Thanks again, you guys---I truly appreciate the help. I'm in the process of completely rewiring my 9N to 12V, and this time around I'm going to get it right!
 
along with that 16$ ic14sb coil, you will need to mod your cap and make a blank off plate to get power to the points, and high voltage to the cap.
 
I've have the distributor cap modified, so that it now has a conventional coil terminal (high voltage). This checks out on the bench, but I have yet to put it on the tractor. I cut the bottom off the old square coil and gutted out the remaining case---these homemade parts allow for capping off the distributor, and holding them in place with the wire bale. I drilled a hole through my homemade top plate, and ran a wire lead from the distributor, which will allow connecting the positive coil wire (low voltage).
Making up these parts has been labor intensive, but I think it will work, and let me go to a conventional 12v round coil.
Round coil will mount just behind the engine block, in a special bracket---I'll run an extra long coil wire in a section of PVC pipe, which is fastened to the existing spark plug wire conduit.
I'm in no hurry, and have much work to do. I'm also completely repainting---got 'er almost all scraped and sanded.
 
mvphoto13981.jpg
 
I just got a 12 volt coil at Tractor Supply that lookrd like the original 6 volt one it worked out fine..
 
Thanks Tim. I kid you not---I was amazed to find a 12V square coil at the local Tractor Supply, and hoped my dream had come true. My new 12V square coil lasted about 5 hours. Before that, I was using the 6V and attempting to step 12 V down with a resistor, and was routinely burning up coils after about 100 hours. I'm tired of replacing coils.
My current thought is that the square coil was eventually phased out by Ford, because the bottom connections are akin to rubbing two wires together, so as to form an electrical connection---not a good way to do it. Position of the square coil (front mount) also means it is subject to intense vibration during operation.
I am also convinced that the modern square coil's use of epoxy resin is not allowing heat to dissipate, which results in premature failure.
I have also discovered another person who did my 12V conversion got it all wrong---it's a wonder the machine ever started!
 
I don't know how long this one will last,,I just repaired it for a neighbor,,,I don't normally work on them...from what your saying it may be back,,Darn it...
 
I really hope it works for him. If my modification does not work out, likely I'll be trying another 12V square coil---I didn't know until recently there even was a 12V.
My whole effort is going to take quite a while. Winter is closing in, and I'll be working on my tractor outside. If I can get up and running come early summer, I'll be quite pleased.
 
(quoted from post at 21:17:29 12/16/14) I really hope it works for him. If my modification does not work out, likely I'll be trying another 12V square coil---I didn't know until recently there even was a 12V.
My whole effort is going to take quite a while. Winter is closing in, and I'll be working on my tractor outside. If I can get up and running come early summer, I'll be quite pleased.
Click to expand...

There are several proven ways to eliminate the original P.O.S. front mount coil... If your conversion does not work out don't give up :!:
 
Thanks Hobo---one way or the other, I mean to get it done. I just finished reconstructing a coil bracket. I'm kinda stuck right now due to cold weather, and I'll need to go just before Christmas and get a bunch of supply at the parts store.
I have nothing but respect for the 9-N. It's been a great machine for about 30 years, but this coil problem has to be solved once and for all.
 
(quoted from post at 01:30:14 12/17/14) Thanks Hobo---one way or the other, I mean to get it done. I just finished reconstructing a coil bracket. I'm kinda stuck right now due to cold weather, and I'll need to go just before Christmas and get a bunch of supply at the parts store.
I have nothing but respect for the 9-N. It's been a great machine for about 30 years, but this coil problem has to be solved once and for all.
Click to expand...

If get hold of a old tar filled one I gut'em... If its epoxy I drill'em...
http://search.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=nboard&th=622946

Bob's is as good as it get's.. He had a update on the original post but I did not save it...
http://forums.yesterdaystractors.com/viewtopic.php?t=737609&sid=70bd7a5135dd70a8927f1694664fe4e7
 

mvphoto14079.jpg

Well Hobo, like yourself, I have now cut cut apart one of each---that's epoxy resin & "tar".
The big difference I'm noting is that the resin model (left in photo) weighs in at 5 oz, whereas the "tar" model (right)weighs in at 8 ounces. Both of these windings came out around 95% complete, so I think the listed weights are fair.
Both coils were sold to me as though they were identical 6V 9N. Obviously there is really a huge difference that would not ever be noticed, in normal conditions. The 8oz. "tar model" is 60% larger than the "epoxy resin model", and that variation combines with a huge difference in packing material.
Not knowing any better, when I started in on the "tar model", I thought "dang, this sucker is really burned up"!
 
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