Car won't start - Day 2

[blown motor]

I had a friend come out this morning to help me trouble shoot this redoing some of what I had done before just to be certain. Ya, I know, everybody has a friend that's really good at this stuff but I do trust his knowledge. Here's the long and short of it. We started the Charger and it started and ran fine. So we took the coil off the Charger and put it on the Challenger. We have power on both sides of the coil as per the test light. We pulled the coil wire off the distributor and held it so it would arc to the dizzy, held it to ground as a bare end and with a spark plug. Nothing! Not one little bit of spark anywhere. There's nothing coming out of the coil. We tried this with the key and by going direct from the starter relay to the coil so we eliminated the key. We had also swapped out the ballast resistor with a new one and no difference. 

[dodj]

Spark energy is created when the power is removed from the coil, were you cycling power on and off to check for spark?

[anlauto]

Try swapping the ignition control module 

[Bullitt-]

If you have a tachometer disconnect it from the coil.... a bad tach can ground out
     

[blown motor]

Got it running.  Long story short I believe it was a bad ground on the REN-N-Nater box.

[JS29]

  

[dodj]

Got it running.  Long story short I believe it was a bad ground on the REN-N-Nater box.

Excellent. Star washers are a good way to maintain a solid ground.