msd trouble shoot

well i bought a 6al at the nats and sunday night I installed it on my car and it turned over the first time i tried to start it it turned over but the second time it wouldnt even turn over (which I assume is a fuse). the car had electronic ignition on it before and I unhooked my orange box, distributor and my coil from the factory system but as soon as i turn my key forward my ballast resistor gets hot. does anyone know why this would be? i know I hooked the msd box up right and its grounded good and I have a msd distributor and coil on also. Any held would be greatly appreciated..... Thank you
seth