Question On Which Coil To Use!

KCTractors

Member
Location
Central Wi
I have been looking for information about the Pertronix Electronic Ignition for the late 8N,600 or hundred series and the early 2000, 4000 (4cyl) engines. Why do some say to use a 1.5 Ohms and others say to use 3.0 Ohms for the coils. Please straighten me out.
 
Setting all BS aside, a 1.5 Ohm coil is gonna kill an Ignitor.

A hundred bucks, more or less, converted to smoke.
 
KCTractor,
My guess is that the 1.5 Ohm is for a 6 volt system and the 3 ohm is for a 12 volt system.
Reason is that most point systems need a 4 amp current flow thru the system to get them to work.
HTH
Keith
 
Keith, you are correct, 'cept 4 Amps is at the TOP of the range for primary ignition current , unless a REAL EI is used.

I "shot from the hip" on this one, and thanks for correcting me/bringing up the 6 Volt possibility.
 
This question is a good example why some people ask 6v or 12v, because the poster for some reason usually wants it to be a secret, and an even order reason is another longtime member her thinks the 6v/12v question should never ever be asked. This is a prime example where 6 vs 12 is good to know.
 
Not to horn in on a thread, but I recently had a coil marked very clearly "12Volt" & "External resister needed". I find that confusing, as it sounds like a 6 volt coil used on a 12 volt system??? Can you tell me what it really means?
 
(quoted from post at 09:28:44 10/28/14) Not to horn in on a thread, but I recently had a coil marked very clearly "12Volt" & "External resister needed". I find that confusing, as it sounds like a 6 volt coil used on a 12 volt system??? Can you tell me what it really means?
It means that it is a coil designed for a 12v system for use with a resistor. Is it a 6v coil? No.
 
(quoted from post at 17:55:21 10/27/14) I have been looking for information about the Pertronix Electronic Ignition for the late 8N,600 or hundred series and the early 2000, 4000 (4cyl) engines. Why do some say to use a 1.5 Ohms and others say to use 3.0 Ohms for the coils. Please straighten me out.

I have Pertronix on one of my ford tractors. As I recall, the instructions provided by Pertronix explain that either will work, but the installation is different. If you choose to use a coil with 1.5 Ohms resistance you need a ballast resistor in series to make the total primary resistance about 3 ohms.....and also a second 12 volts wire bypassing the ballast resistor so that the Pertronix module gets a full 12 volts. Or, just by a coil with 3 ohms primary resistance and forget the ballast resistor. If you do this the same 12 volt wire can power both the coil and the Pertronix module. I used a Wells LU800 coil with nominal 3 ohms primary resistance and eliminated a ballast resistor. You can get the LU800 at Autozone and there are other brands with similar primary resistance. Don't get hung up on 12 volt vs. 6 volt coil, its the primary resistance that counts.

BTW, Pertronix is the best thing that ever happened to my 3600 Ford. Runs much better and more reliable spark. Should have bought it many years ago and not messed with points.
 

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