Smoked HEI coil.

And now, a story from the old days. . ..........My cousin used to have a '70's Jeep Wagoneer with the breakerless system they used, Autolite? Don't remember. Anyhow, he comes into the store one day and wants a replacement ignition module

Says, "you know what might be causing them to go bad, this is the third or fourth one!!!"

I thought a second, "your kids maybe listening to the radio with the key on, you know, like the engine is on?"
HE LOOKS AT ME REALLY FUNNY!!! and says "how else do you listen to the radio?"

TURNS OUT HE WAS THE GUILTY!!!! Didn't know the difference between "run" and "accessory!!!"