You need a push to break switch. Drill the door seal flange and mount it that way. It will look like something like the third switch down on this first link. What this switch does is break the power feed in the pushed configuration. When the switch is allowed to push out it closes and lets power threw.
http://www.kpsec.freeuk.com/components/switch.htm
Don't forget to put a regular toggle switch to kill the circuit when you need into the box.
If you want it to beep just add a heavy duty turn signal flashing into the power feed.
http://www.kpsec.freeuk.com/components/switch.htm
Don't forget to put a regular toggle switch to kill the circuit when you need into the box.
If you want it to beep just add a heavy duty turn signal flashing into the power feed.
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