Most of us will settle on a happy medium after a few bowls of experimentation
Steady-State Passing of Current through a Contact below!] Generally, I highly recommend if anyone is going to use their vintage Cig Lighter...or even a more modern replacement power socket, which is likely china's (not-so) best, for any purpose, from it's original, to merely supplying power to your phone/GPS, to add an inline fuseholder of whatever type you can easily procure, and install a fuse rated appropriate to the expected load which will be operated...this means 20A for Cig Lighter, 3A for a phone/GPS
Make your property smoke free
Give the vine its own dedicated support, whether that is a trellis, arbor, or wire system against a wall, and train any co-climber like clematis onto a clearly separate section of that same structure from the start, rather than letting both vines find their own way and tangle
And he doesnt mince his fucking words either, you know