starter and killswitch wiring

The answer lies in the hot wire from the Alternator.
Disconnect the main alt wire, and run a new one back to the positive battery post or to the battery side of the switch.
Make sure you cover the original one real well, so it doesn't touch anything.
Once the engine is running the battery is just along for the ride, the alternator does all the work.
The only down side to doing this is the amp gauge will no longer work, as I beleive the power runs from the alt thru the gauge then to the rest of the system.