Live Coil Voltage Levels: Pix

...........and also partly why it explains how you can get the everlovin' $### $hocked out of yourself on anything on the coil neg, including the tach wire or the heat sink area on an ECU

Years ago, I used to have a 340 in an old Landcruiser FJ-40. For awhile I had an Mopar box on it. We'd get through the mud and up in the snow, and sooner or later.........get warm melted snow and mud in the "engine room" and on the ECU. Took me awhile to figure out "that mysterious miss" in the engine when wet

I finally moved the ECU and coil up under the firewall, and in fact bought one of the early MSD "plug and play" Chrysler replacement boxes. This was in the mid 70's AND I STILL HAVE the MSD!!!

Also, many guys don't seem to realize that these girls won't run (breaker points) without a good "condenser"