Coil question
Thread Starter
Cruising
Joined: Jun 2006
Posts: 10
Likes: 0
From: Westford MA
Coil question
I just picked up a replacement coil for my 74 350 from Napa and on the coil is printed "External resistor required". I have traditional points based ignition
Stupid question but what does that mean? Would there already be such a resistor on a stock car?
This is the coil
http://www.napaonline.com/masterpage...=Ignition+Coil
Stupid question but what does that mean? Would there already be such a resistor on a stock car?
This is the coil
http://www.napaonline.com/masterpage...=Ignition+Coil
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
I have a document on how to test this.... let me see if I can dig it up.
Ok.... read the first paragraph labeled IMPORTANT
This will determine if you have the factory resistor in line which I am almost certain is the case.
http://go.mrgasket.com/pdf/2010.pdf
Ok.... read the first paragraph labeled IMPORTANT
This will determine if you have the factory resistor in line which I am almost certain is the case.
http://go.mrgasket.com/pdf/2010.pdf
Last edited by Bob Onit; Jul 27, 2007 at 11:22 AM.
Racer
Joined: Mar 2007
Posts: 278
Likes: 2
From: Wellington Florida
You should have a resistor wire built into the ignition if it is stock. Easy way to test is to take a voltmeter and check the voltage at the positive side of the coil with the engine running or ignition on. It should be 10.5 volts or less. If it is 12 volts then you don't have a resistor wire and would need to install an aftermarket balast resistor between the ignition wire and positive side of the coil. Good luck.
