I have actually burnt a wire in front of such "lektrishann" I simply took out the bulb socket, wired it dead short to ground right on the socket - and then watched his "nishaan wali relay aur motee taar" melt and ignite also.
lol - good times.
I have come across tons and tons of cars with what I call maggi noodles wiring, e.g. side one parking lamp dead, electrickshan puts a wire from the other side of the car. with wire sitting right on top.
This sort of repair is done by the owner himself when there is no civilization in sight and one has to get the job done. I have had to run two headlamps on circuit because the other one had a broken wire somewhere.
But if someone is charging money and doing this **** - they deserve a solid kick.