Before heading to the Rockies for our annual climbing trip this summer, I wanted to add a "kill switch" — we were going to be deep in the back-country for a while with the van parked at a trailhead near the busy #1 Hwy.
My goal was to have a discreet/hidden switch (accessible by the driver when seated at the wheel) that would immobilize the van. This can be flicked into “kill” position when leaving the van parked in a dodgy location (or activated quickly and discretely in the unhappy event of an attempted hi-jacking).
Adding a switch to the fuel pump ground avoids interfering with the fuel pump power supply. (Pull off the spade connector for the fuel pump ground wire and leave it in place for possible later use. If any part of the kill-switch wiring ever gets cut or damaged, just pop off the new spade connector from the switch wire added to the pump and reconnect the original spade, about a 10 second process).