OK I just the Duster fired up today! It onlt runs/starts when I groung the ignition hot wire. I don't have a ballst resistor hooked up. do I need one? It won't run when I unhooked the jumper wire I rigged up. Any thoughts?
No, you dont need a ballast resitor with a MSD box. Only runs when you GROUND the ignition hot wire? That seems fishy. I'd do a couple things first off to just check.
Make sure you have 12volts to the big red wire all the time...aka hooked directly to the battery.
Make sure that the 'switched' 12v wire has power in both the Run and Start position. If you have it hooked to the stereo, blower motor, etc..it will not fire until you let go of the start position.
I'd pretty much trace all the wires and make sure everything is properly connected.