A "hot" positive wire has made contact with ground = short circuit.
Short in circuit wiring or circuit overloaded.
The short circuit location can be found by a diagnostic tester. When the short circuit is located, replace the wiring or switch.
Short in the wiring, short in a socket, or overloaded circuit.
Short in the wiring, fuse too small for the circuit, circuit overloaded, or short in something plugged into the circuit.
A short circuit would blow a fuse. Most fuses are marked as to which circuit they protect. Now that you know which circuit is shorted you can examine the suspected circuit for problems like damaged/pinched wiring to ground.
Short in the wiring or the circuit is overloaded.
You need to find the short circuit in the wiring.
A short circuit in the wiring or in the switch.
Short in the wiring or the circuit is overloaded.
To prevent an overload or short from causing the wiring in the circuit supplying power to the appliance from overheating and possibly catching on fire. The fuse is there to protect the wiring and not what is plugged into that circuit.
Short in the wiring, or the circuit is overloaded.
Replace the lighter housing. If that does not fix it, look for a short in the wiring.