no spark
Copied from msd :
No 12v present at Coil +
1.One common question in regards to MSD Ignition controls is Why isnt 12V power on the orange (COIL +) wire?
The main reason 12V wont be present at coil + is because your MSD ignition is a Capacitive Discharge Ignition. Like all CD ignitions they use a large capacitor to discharge 420-480 Volts to coil + and coil will normally be connected to ground. (Thats why you wont see +12V on coil +)
2.Most all stock ignitions are Inductive Ignitions, these will normally be connected to the + 12V ignition switch to coil + and coil is connected to Points or the Factory Electronic Module. (Thats why youll see +12V on coil +)
http://www.msdignition.com/page.aspx?id=3206