No spark

twodog45 said

Update:

With key on there is 12.4v on bith the negative and positive side of the coil.
When cranking they both drop down to approximately 10.5v

Click to expand...

RE-read post 37. If the voltage to ground from coil pos and coil neg are the same, the COIL IS NOT DRAWING CURRENT

Either there is a harness or connector issue, the ECU is bad or not grounded, or the coil is open.

The ECU acts as a SWITCH very similar to breaker points. Your circuit is ignition switch, through bulkhead connector, through ballast resistor, through coil, and to ground through the (breaker points) ECU box.