My 28 ford PU hot rod is using an old duraspark that works well.
The original wiring of the donor car used a length of resistance wire in place of a ballast resistor. This was with the original coil.
I put a MSD blaster coil in place of the original coil. I used a Borg Warner RU19 ballast resistor in place of the resistance wire. The RU19 cannot handle the watts and heats up. High voltage is fine and coil does no heat up.
Does the MSD coil even need a ballast resistor. I assume that the original coil required that the voltage be stepped down a few volts in the run mode. In the start mode, they bypass the ballast resistor with the starter sol. terminal I, which applies 12 volts directly to the duraspark.
Seems to me the ballast resistor is simply creating a I*R drop to reduce voltage to the original coil.
Any help from the forum is appreciated.
Thanks
Bob, Gacannon
The original wiring of the donor car used a length of resistance wire in place of a ballast resistor. This was with the original coil.
I put a MSD blaster coil in place of the original coil. I used a Borg Warner RU19 ballast resistor in place of the resistance wire. The RU19 cannot handle the watts and heats up. High voltage is fine and coil does no heat up.
Does the MSD coil even need a ballast resistor. I assume that the original coil required that the voltage be stepped down a few volts in the run mode. In the start mode, they bypass the ballast resistor with the starter sol. terminal I, which applies 12 volts directly to the duraspark.
Seems to me the ballast resistor is simply creating a I*R drop to reduce voltage to the original coil.
Any help from the forum is appreciated.
Thanks
Bob, Gacannon