there would be 2 blue wires on one end of the ballast, one coming from the ign1 (run) ignition switch terminal via the bulkhead and the other going to the "ign" terminal on the "box" reg. The other end of the ballast would have a brown wire coming from the ignition switch ign2 "crank" terminal via the bulkhead & a blue wire going to the coil positive primary terminal