i installed an msd system on my car. all the wiring was done correctly. somehow someway when we cranked a wire friend in the harness..luckly to a certain point and just replaced the wire and put my stock ignition system back on.. But i dont know how the wire fried but could it be because we took off the coil from the ignition cap and put it on a screwdriver to see if theres a spark?? any info would help