Originally Posted by Sunroofcuda
Originally Posted by Andrewh
ballast is bypassed during start.
so if it was the ballast you would expect it to start then die when you let off the key.


Not necessarily true. I had a ballast resistor go bad years ago on a '71 Charger & it would start & run just fine, then just cut-out at very inconsistent intervals.

OP, start it & then get out & wiggle the wires connecting to the BR - if it sparks & shuts off, then it's the BR.


The point was that the ballast is not used during start. So if it won;t start it's probably not the ballast.

OP later does say that there is spark when it won't start so the issue probably isn't ignition related, unless the timing is way off. Jumped timing chain?