After replacing engine I am not getting any spark from the coil

I replaced the engine and have everything hooked up correctly as far as I can tell. I tried starting the engine but I get no spark from the coil. This is a 5.9 liter magnum engine. I have checked the circuit to the coil and cannot get 12V. I hooked up a small wiring harness between the coil and the connector and checked for voltage and have no voltage, then I tried that while starting and got a flash of 11.93 volts then it dropped off to 0 voltage. This circuit also includes the injectors and I get no pulse for them. I would like to know where this circuit starts and any information about testing this circuit. Also can you point me to a more indepth wiring diagram than in the Haynes manual.

Thanks guys and I'm sure you will need more information from me but this is a starting point.

John