Bartamos, I'll admit, that posting is somewhat 'wordie'. To 'boil' it down. When I attached a heavy jumper from (+) battery to (+) side of coil with alll circuits hooked up as normal, the truck would start then die. I then disconnected the run circuit wire from the (+) side of coil with jumper still hooked up. Truck started and continued to run. I then measured the resistance to ground of the run circuit wire with it disconnected at the ballast and ignition off. Resistance should be infinitedy as the wire is open at both ends. It measured 20 ohms.
In electrical jargon, I have a parallel circuit. One through the coil and points to ground. The other through a short in the wiring harness. This is not allowing the proper amount of current to travel through the coil thus causing a weak spark.
This would be the same situation as a leaking condenser or a pinched feed wire at the distributor for the points.
This is a 1964 C10 with a 230ci engine.
The wiring harness has been hacked on by a PO and we've all been through that mess. The normal resistance wire was shorten at some point so I was getting too much voltage at the (+) side of the coil thus the addition of the ballast resistor.
Sorry, still 'wordie'.
