8N Ignition Coil Wiring

Isaac.

New User
Hello all,
I know this topic has probably been beat to death on here, but I would like some opinions on what the appropriate setup is for the 8N tractor(originally 6V, converted to 12V) I'm rewiring for my father. I removed all the wiring from the tractor and am in the process of making a new harness for it, but I believe I was sold the wrong ignition coil by the store on this site and need to double check if the info I've gathered is correct. The "12V" coil I purchased has around 1.4Ω of resistance, which combines with the ballast resistor for a total of about 1.8Ω in the ignition coil circuit and draws nearly 8A of current. From what I've read, I should shoot for about 4A through the coil, does that sound about right? I've tried contacting the site's store to make sure I was sent the right coil and was ignored, so I guess at this point I'll try to figure out the right sized resistor to bring the current draw down.
 
(quoted from post at 15:29:19 03/29/15) Hello all,
I know this topic has probably been beat to death on here, but I would like some opinions on what the appropriate setup is for the 8N tractor(originally 6V, converted to 12V) I'm rewiring for my father. I removed all the wiring from the tractor and am in the process of making a new harness for it, but I believe I was sold the wrong ignition coil by the store on this site and need to double check if the info I've gathered is correct. The "12V" coil I purchased has around 1.4Ω of resistance, which combines with the ballast resistor for a total of about 1.8Ω in the ignition coil circuit and draws nearly 8A of current. From what I've read, I should shoot for about 4A through the coil, does that sound about right? I've tried contacting the site's store to make sure I was sent the right coil and was ignored, so I guess at this point I'll try to figure out the right sized resistor to bring the current draw down.
hat is correct, select coil+ resistance for 4 amperes, or just get a coil with total resistance of about 3.25 & skip the resistor.
 

Thanks for your input, I had a feeling that was correct but wanted to make sure. I thought I was supposed to be able to get by with only the ballast resistor and a 12V coil but that does not appear to be the case here.
 
(quoted from post at 20:16:13 03/29/15)
Thanks for your input, I had a feeling that was correct but wanted to make sure. I thought I was supposed to be able to get by with only the ballast resistor and a 12V coil but that does not appear to be the case here.
hat is generally the case with front mount Ns, but their 12v coil is usually 2.5 Ohms.
 
Isaac.........um? You do know most stores are "closed" on Sunday, don't you? That is the UNFORTUNATE thing about the modern 12-volt 4-nipple coil, its NOT MARKED. So being able to read the resistance is a good thing. It should be about 3-ohms from top to either bottom contact. Surprizingly enuff, with either squarecan coil, they use the SAME ballast resistor. Problem with using the 6-volt coil on a 12-volt conversion, is you still need an additional 12-to-6 volt converting resistor. Me? I strongly advocate using the new modern 12-volt squarecan coil in 12-volt conversions. NO addition resistor needed. Surprizingly enuff, you use the SAME points and condenser, 6-or-12 volts. .........HTH, Dell, a 12-volt advocate for the right reasons
 
(quoted from post at 17:57:51 03/29/15) Isaac.........um? You do know most stores are "closed" on Sunday, don't you? That is the UNFORTUNATE thing about the modern 12-volt 4-nipple coil, its NOT MARKED. So being able to read the resistance is a good thing. It should be about 3-ohms from top to either bottom contact. Surprizingly enuff, with either squarecan coil, they use the SAME ballast resistor. Problem with using the 6-volt coil on a 12-volt conversion, is you still need an additional 12-to-6 volt converting resistor. Me? I strongly advocate using the new modern 12-volt squarecan coil in 12-volt conversions. NO addition resistor needed. Surprizingly enuff, you use the SAME points and condenser, 6-or-12 volts. .........HTH, Dell, a 12-volt advocate for the right reasons

I appreciate your advice, but it's been about 3 weeks since I emailed the store, so I don't think we can blame it on being a Sunday. My invoice says they sent a 12V coil, but the resistance reading says they sent me a 6V and I would rather just buy an additional resistor rather then try to get them to correct it. Thank you guys for weighing in, I wanted to make sure I wasn't missing something before changed the setup to accommodate the 6V coil.
 

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