Which ballast resistor?
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Posting Guru
Joined: Sep 2006
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From: Bristol TN.
Which ballast resistor?
Hey guys, I bought an 85 mustang distributor, an "accel" coil, stock 85 mustang ignition module, stock starter solenoid....but I need a ballast resistor. Which ballast resistor do you guys recommend? All I seem to find are aftermarket resisters and don't know which to choose. I converted this engine from EFI to carb and everyone recommended to go the duraspark II route.
Senior User
Joined: Oct 2010
Posts: 164
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Each type of coil needs a certain numbers of ohms resistance in ratio to the voltage . The coil resistance has nothing to do with the rest of the ignition system . A 6v coil will work in a 12v system if you have enough ohms resistance . Too much and you have a weak spark , too little and you fry the coil eventually .
Best bet would be to go to "Accel's" web site and use the recommendations for their coil .
One neat thing about the resistors is when you first power the coil it is getting the full voltage and a hotter spark to start the motor . Shortly after the resistor starts working and drops the power to the coil , keeping it from overheating .
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
Stock resistor for 76-82 DSll is 1.1 ohms. For 85 I believe the TFI coil was used, and out of my knowledge base. As Ken posted, refer to manufacturer for whats recommended for which coil.
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