An ageing Talbot Alpine I once owned had the same arrangement. It had a set of sprung brass pins sticking out of the tailgate which made contact with a set of contact pads on the frame when closed. Never gave any trouble.
The only problem I ever had with electrics at that end of the car[1] was that the boot light didn't work when I got it. Obviously the switch, but could I find the thing? Turned out that what looked like a little blanking plate on the side of the tailgate was actually a mercury tilt switch, which the contacts had "gone" on.
[1] The other end was a rather different story......
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Honda Accord Tourer - Failed MOT - Rear .. new
Honda Accord Tourer - Failed MOT - Rear.. new