Ok you need to be more specific about what you are talking about. Your ran what "start 12v" and you ran this to where?
If you ran your start wire that goes from the bulkhead over to the start relay--and branched that off to the coil, you have created a problem, as the starter relay will drain off coil power through the ballast
The start wire to the start relay (usually yellow) and the coil ballast bypass circuit (usually brown) do the same thing at the same time, but they are separate contacts on the ignition switch to prevent backfeed
