![](http://2.bp.blogspot.com/_43jDKyabaZc/TKL8vm5LMCI/AAAAAAAAAMQ/LwZRnfd8WPg/s400/coil+test.jpg)
![](http://2.bp.blogspot.com/_43jDKyabaZc/TKMAVuPusuI/AAAAAAAAAMY/YjZeKnPgMLw/s400/wasted+coil.jpg)
Wasted spark coil pack.
Testing ballast resistor.
Ballast resistor number: 13R3
Specifications: 1.5-1.7 ohms
Measured resistance: 1.6 ohms
This ballast resistor in manufactures specs and still can be used.
![](http://1.bp.blogspot.com/_43jDKyabaZc/TKMFdFdPX1I/AAAAAAAAAMg/x0aoIE-Rmuk/s400/Coil+set+up.jpg)
Measuring current draw and voltage drop of standard single tower coil.
Calculated voltage drop and measured voltage drop are equal as the Ohms Law says Volts=Amps*Resistance.
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