Hi guys,

This past weekend my 1970 Challenger finally pulled it's first "no start" on me (after 5+ trouble free years). I went to fire it up and it just cranked and cranked ..

Checked for fuel and it was fine. Took off the distributor cap and verified the rotor was turning. Checked for spark at the distributor-to-coil wire - nothing. I then swapped out the ballast resistor to a brand new one I had - still no spark.

Finally, I put a multimeter to the coil and checked for voltage with the key both in the "run" position and while cranking - zero voltage both ways.

I know very little about electrical problems, so I'm not sure what to try next? Could the coil or ECU (Mopar Orange) box be bad? Or something earlier upstream like the ignition switch or bulkhead piece? If so, how to test these things?

The car has started so reliably in the past that it surprised me something could have just gone dead without going flakey first, but I guess anything can happen..

Any tips on what to check next would be greatly appreciated!

Thanks much!