msd ignition
New User
Joined: Jan 2008
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Likes: 24
A ballast resistor decreases the amount of voltage to the primary circuit of the coil.
A resistor wire in used in some 70's truck then newer shown here on the DSIII system coming out of the ignition switch.
Ford Ignition runs on 8.2 volts minimum... so, if it had 12v running to it...the coil would burn up.
I don't think MSD uses a BR (check their web site to make sure) so you you can run a 12V source to the coil key on.
http://www.msdignition.com/1ignitions.htm
A resistor wire in used in some 70's truck then newer shown here on the DSIII system coming out of the ignition switch.
Ford Ignition runs on 8.2 volts minimum... so, if it had 12v running to it...the coil would burn up.
I don't think MSD uses a BR (check their web site to make sure) so you you can run a 12V source to the coil key on.
http://www.msdignition.com/1ignitions.htm
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Actually the ballast resistor is in the RUN circuit so they can design the coil for maximum spark at the low voltage available while cranking the engine, then use the same coil to run continuously. A computer controlled ignition system can control dwell time to avoid overheating the coil. What MSD does is unknown. Check their tech department like Dennis suggested.
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