I have this done per instructions brown coil positive and switched blue wire white trace from ballast wiring tied together with the little red 12v feed wire to mad 6a
and how is that working? the problem is as previously explained.
If you put a meter on the red trigger wire to the MSD box, I would bet that either a) it is only hot when cranking or b) it is NOT maintaining a minimum of 12 volts while cranking.