12v key on problem

Eric Pearson said

Good evening everyone. I have recently installed a new motor in the duster. I also installed a complete MSD ignition. The problem is that when I crank the motor with the key. The 12v key on power disipates tho around 6v. Which will not fire the ignition. I put my voltmeter on everything that has 12v key on power and all of them the voltage drop’s. Anyone have any advice for me. I would greatly appreciated it. Thanks

Click to expand...

With the key on run (Start 1), the power flows through the ballast resistor, which drops the voltage for longer ignition component life.

With the key in the starter engagement position(Start 2) the power flows around the ballast resistor to give a hotter spark for better/quicker cold and warm starts.

Be sure to check your grounds for quality and quantity. Your voltages seem pretty low as described. How old is your battery?

I seem to remember that MSD Ignitions don't use the ballast resistor, but it's been a long time.