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separated, the blue side has full battery voltage in 'run' and the brown side has full voltage in 'start', but combine the 2 sides either by the ballast, OR, jumpering them together, and the voltage drops 2.5 volts from full battery voltage.
The Hei conversion says it HAS to have a full 12 volts at all times or it wont live..

The brown side will always drop several volts at least from the starter draw. The brown side cannot have 12+ volts during cranking cuz the starter draws alot & will drops to ~10 V or so whether it is tied to the blue wire circuit or not. If you tie the two together the 10+ during cranking will be enough to fire the HEI and when it starts it'll be fed 13+, the normal charging voltage

live every 24 hour block of time like it's your last day on earth