12 volt conversion & electronic ignition

Ford NAA after installing the 12 volt conversion and electronic ignition I am have starting problems. The engine will "catch" after I release the starter button. It makes for hard starting and is especially bad when the engine is hot.
 
Which Ignition kit did you use? If you used the standard Pertronix (version Ignitor 1), the instructions give strict requirements for ohms
resistance on your coil primary. Did you measure your coil? I just put a Ignitor #1 kit on my NAA and it starts better now then it did
before with points. Sounds like you have too much coil resistance.

By the way - just curious. I had trouble with my install. The plastic dust cap that goes under the distributor cap was interfering with the
Pertronix breakerless module. I had to drill out the center of it. Otherwise the module would of been ruined pretty quick.
cvphoto823.jpg
 
(quoted from post at 05:42:52 04/10/20) Which Ignition kit did you use? If you used the standard Pertronix (version Ignitor 1), the instructions give strict requirements for ohms
resistance on your coil primary. Did you measure your coil? I just put a Ignitor #1 kit on my NAA and it starts better now then it did
before with points. Sounds like you have too much coil resistance.

By the way - just curious. I had trouble with my install. The plastic dust cap that goes under the distributor cap was interfering with the
Pertronix breakerless module. I had to drill out the center of it. Otherwise the module would of been ruined pretty quick.
<img src="https://www.yesterdaystractors.com/cvphotos/cvphoto823.jpg">

My install went well. No rubbing. I used the coil supplied, so I did not check the resistance. I agree with the other response and will get rid of the resistor. Thanks.
 
I still do not know what make and model ignition you have. If it is Pertronix, I did not know they came with coils. New coils can be ordered
from the same company as a separate item. As per the install instructions, it is up to you to verify the primary resistance is correct.
 
Because of a 12v conversion do you have a resister to the coil if so you will need a resister bypass wire from the solenoid. You will need a solenoid with 2 small post
 
I did order the coil on a separate line item. I have not looked back at my order. No problem though. I took the resistor out of the circuit and the problem is fixed. Thanks to all who made suggestions.
 
(quoted from post at 19:13:17 04/10/20) I did order the coil on a separate line item. I have not looked back at my order. No problem though. I took the resistor out of the circuit and the problem is fixed. Thanks to all who made suggestions.
ou are welcome.
 
(quoted from post at 17:21:04 04/10/20) Because of a 12v conversion do you have a resister to the coil if so you will need a resister bypass wire from the solenoid. You will need a solenoid with 2 small post

You can't use a 6 volt coil with a ballast resistor in a 12 volt system with a Pertronix Electronic Ignition system. You must swap out to a true 12 volt coil.
 
(quoted from post at 00:28:31 04/11/20)
(quoted from post at 17:21:04 04/10/20) Because of a 12v conversion do you have a resister to the coil if so you will need a resister bypass wire from the solenoid. You will need a solenoid with 2 small post

You can't use a 6 volt coil with a ballast resistor in a 12 volt system with a Pertronix Electronic Ignition system. You must swap out to a true 12 volt coil.
hy not?
 
In other words I must be peddling my NAA and 641. Both are 12 volt. Both have Pertronix ignition. Both are using the ceramic style resister. In fact I believe Pertronix explains how to do this in their instructions.
 
I see a few incorrect comments here. I realize you fixed your starting problem. That said, a ballast resistor can certainly be used. In
fact, Pertronix recommends adding one in certain situations. To say it won't work with a added resistor is just plain silly.

Pertronix Ignitor kit for a NAA Ford is # 1244A, IF used with a 12 volt system and negative ground. It calls for primary resistance on the
coil of at least 3 ohms. NO ambiguity here.

An OEM Ford coil that came on a Jubilee/NAA has a primary resistance of 1.17 ohms. If that tractor is switched to a 12 volt system,
usually a 1.8 to 2 ohm ballast resistor is added to the OEM 6 volt coil. That comes to total resistance of 3 ohms (or more) which is the
minimum requirement for the Pertronix.

Pertronix simply has two requirements for the Ford four-cylinder engine. Primary resistance MUST be at least 3 ohms and it does not matter
how you do it. Also, there cannot be too much resistance that causes primary voltage to ever drop below 6 volts.

I note that I the NAA I just worked on. It was still a 6 volt system, but had a 12 volt-only coil someone added so it had weak spark with
the old points system. Then the owner changed over to 12 volts and added a ballast resistor and it still had weak spark. If that resistor
had been left off, it would of been fine. This however, was just a mess of mis-matched parts.
cvphoto1029.jpg


cvphoto1030.jpg


cvphoto1031.jpg
 
(quoted from post at 07:15:38 04/11/20)
(quoted from post at 00:28:31 04/11/20)
(quoted from post at 17:21:04 04/10/20) Because of a 12v conversion do you have a resister to the coil if so you will need a resister bypass wire from the solenoid. You will need a solenoid with 2 small post

You can't use a 6 volt coil with a ballast resistor in a 12 volt system with a Pertronix Electronic Ignition system. You must swap out to a true 12 volt coil.
hy not?

Sorry, I have no actual experience, but it was my understanding that a ballast resistor somehow interfered with the proper functioning of the EI system. I have read many threads from folks who have had problems until they replaced the 6 volt coil and ballast resistor with a proper 12 volt coil.

Also, in your first post in this thread, you say to chunk (I assume that you meant chuck, as in throw away) the ballast resistor if it has one, but then later question me when I recommend the same thing. If you get rid of the ballast resister on a 6 volt coil in a 12 volt system, are you not supposed to replace the coil with a true 12 volt coil?
 
(quoted from post at 11:14:58 04/11/20)
(quoted from post at 07:15:38 04/11/20)
(quoted from post at 00:28:31 04/11/20)
(quoted from post at 17:21:04 04/10/20) Because of a 12v conversion do you have a resister to the coil if so you will need a resister bypass wire from the solenoid. You will need a solenoid with 2 small post

You can't use a 6 volt coil with a ballast resistor in a 12 volt system with a Pertronix Electronic Ignition system. You must swap out to a true 12 volt coil.
hy not?

Sorry, I have no actual experience, but it was my understanding that a ballast resistor somehow interfered with the proper functioning of the EI system. I have read many threads from folks who have had problems until they replaced the 6 volt coil and ballast resistor with a proper 12 volt coil.

Also, in your first post in this thread, you say to chunk (I assume that you meant chuck, as in throw away) the ballast resistor if it has one, but then later question me when I recommend the same thing. If you get rid of the ballast resister on a 6 volt coil in a 12 volt system, are you not supposed to replace the coil with a true 12 volt coil?
DEM's rather thorough post early this AM ought to walk you through, with understanding. My initial take was that his coil current was too low, thus skip the ballast.
 

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