I remember attending a failed F3 many years ago, and pulled the master switch on that occasion. This was easily confirmed as the red light went out. When we returned, we discovered the electric dash was still on. Turned out they didn't want to risk losing the data, so had connected it directly and not through the master.
Perhaps it's something that should be part of scrutineering. Start the car, switch on everything electircal, pull the switch, let's see if anything's still on.
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