Mopar electronic ignition

Helping a friend with his Satelitte. It's a 440 auto. He has a electronic ignition on the motor. It doesn't ignite when cranking the engine.
I've helped him with replacing the electric harnesses both under dash and in the engine bay this winter.
When attaching the timing light to the wire from the coil to the dist it flash.
But nothing when attached to a spark plug wire. He bought and replaced both the rotor and dist cap to no avail.
We got 6V at the coil in run position and 12V at start. Tomorrow we'll check the resistance on the wire between the coil and dist to see if it's okey.
Does any of you guys or girls got an idea of what can cause the problem.
Any help are most appreciated.
Lenny