electronic ignition

Armand

Member
Well I tried it.. It was the easiest thing I ever did to an engine. I had more problems fitting wipers on an older auto. It starts on the first turn and purrrrrs nicely. Holds the RPM's better also when bush hogging. Bought the Petronics model from this site and I am very satisfied. No more points and condenser.
 
Congrats. You are right about an easy job and no more points/condenser problems. Changed over one of my TO30's a few years ago and am
waiting for the postman to bring me another kit to change another.

Thanks for the update.
 
Yes, agreed, very easy and well worth it! Just waiting for a few extra bucks to do my second one.
 
The only thing I had to do was enlarge the dust cover opening to fit properly over the adapter that slides over the cam. They even mention that in the instructions. Piece of cake......
Quick question on the ballast. Instructions state if you have one leave it on. I checked the coil it is a Napa 905 and has 5.9 resistance. On the coil is stamped no external resistance required. Would removing the ballast cause a problem?
 
If you have a coil that states no external resistor required, you probably didn't need the ballast resistor in the first place. I think you'd be safe to take it off. The one I converted has the coil with internal resistor so it has no ballast resistor. Works fine.
What the ballast resistor does is reduce the voltage to the coil under normal operation but when you are starting the engine the ballast resistor is bypassed to give it a stronger spark on starting. On old coils without internal resistor you could burn things up quicky without a ballast resistor.
 
Its working good as it did before the update. The same coil was there and the ballast. Im kinda of nervous to remove it but I would like to get rid of it and have less parts to worry about. I am a little skeptical as I am new to all of this. Still learning thanks to you guys.
 
You really need to know the resistance of the coil to make the decision about the resistor.

If there is a part # on the coil, look up the specs on it. Or, with the leads disconnected, check the resistance with an ohm meter. A 12v coil that does not need a resistor will be around 3 ohms. If it's lower, like 1.5, it will need the resistor.

Running the wrong coil will stress the new electronic kit. It might run just fine, but it might kill it, especially if the ignition were to be accidentally left on. If it runs and starts well as is, best wait until you know before changing it!
 
"I checked the coil it is a Napa 905 and has 5.9 resistance. On the coil is stamped no external resistance required. Would removing the ballast cause a problem?"

That coil will work without a resistor.
 
I checked it with a good digital multimeter and the resistance did show 5.9.. Thanks for the time and info.
 
There is no Napa coil with a part number of 905

What coil do you REALLY have?

Ps, how did you measure it to get 5.9?


What meter? Auto ranger or manually selected scale. 5.9 ohms of primary resistance are only about 2.13-2.44a at nominal bat to nominal alt charge voltage.. That's pretty puny..

So, tell us what coil you have.
 
(quoted from post at 11:01:40 09/05/15)
The printing on the coil states "NAPA 905" , and also states no external resistance required. I checked the resistance with all wires disconnected and and checked resistance between the positive and negative on the coil. The 905 maybe a model number for all I know. I was just concerned with the resistance




There is no Napa coil with a part number of 905

What coil do you REALLY have?

Ps, how did you measure it to get 5.9?


What meter? Auto ranger or manually selected scale. 5.9 ohms of primary resistance are only about 2.13-2.44a at nominal bat to nominal alt charge voltage.. That's pretty puny..

So, tell us what coil you have.
 
(quoted from post at 22:31:37 09/10/15) No reply?
I did reply look at the previous message. To add to the above...... I used a digital multi meter on the 200 scale ( not the 200K) and thats what it read. It is not a top of the line meter so maybe thats the problem. I will check it again with another meter I have, It is a techmaster digital multimeter. It should be good it cost me $160 a while back.

I am not a master electrician by no means just a hobbyist so let me ask a question... If I put the meter on infinity and check the ohms on the leads if it doesnt read zero should I subtract that from the resistance I get on the coil. The techmaster reads zero, but I didnt check the meter I used on the coil but I will. Thanks
 
A meter that wont zero or has to trim zero is junk.

Even if it does zero, that I no guarantee of accuracy.

Ohm meters are very poor at measuring single digit low ohms.

I saw no reply to my post asking what coil you really have. The number you supplied is not a nape coil number, which is why I asked again.

5.9 ohm primary is highly unlikely...
 
It says NAPA 905 maybel a model number or some other company using their name to appear as a Napa product.

As for the resistance I will use the better meter and see if I get the same numbers. Is using the 200 setting the proper way or just ohm it out
 
I took a reading with a better meter and I got 4.59 for resistance. The meter is a techMaster True RMS digital multimeter. I am also including a picture of the coil. I googled Napa 905 and some results were for a Napa 905 coil, but the posts are from 2005 and not much info. I gonna guess its an outdated model and from what I read I think it had 1C14SB as the part number. Not sure about that. I searched Napa and that part number does not come up.
27458.jpg
 
I took a reading with a better meter and I got 4.59 for resistance. The meter is a techMaster True RMS digital multimeter. I am also including a picture of the coil. I googled Napa 905 and some results were for a Napa 905 coil, but the posts are from 2005 and not much info. I gonna guess its an outdated model and from what I read I think it had 1C14SB as the part number. Not sure about that. I searched Napa and that part number does not come up.
27458.jpg
 
Ic14sb has a primary resistance around 3.25ohms.

Very, very common coil .

Matters little if your meter cost 12$ or 120$, low ohms are usually not read correctly.
 

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