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Ignition coil resistance, ballast resistor


Pmaenner
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Hi Everyone,

    Been searching around and can't seem to find the info.  On a  stock R1, what should the primary and secondary resistance of the ignition coil be?  Also, what should be the resistance of the ballast resistor when its cold?  Thanks!

 

-Pete

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I think you I'll find that a typical 12volt coil, with external ballast resister will have a primary resistance of 1.5 -2.0 ohms.  If it has an internal resistor, it will run around 3.0 - 4.0 ohms.  In both cases, the the secondary will be around 9000 - 10000 ohms.  High performance coils will often have a lower primary resistance, and should not be used with your points system. 

If your car is a later model and has an SBC high energy system, the primary will be around 1.0 ohm.

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