I had several wires at that point melted as well.....
LONG story short, I had to rebuild a 3rd of the wiring harness. I had melted wires all over the place.
Here is what I found: AFTERMARKET stereo install gone wild. That is where the harness started to melt. The owner at the time kept blowing fuses, obviously
, so SHE(yes SHE) had someone put new fuses' wrapped in foil in the fuse block. I am surprised the car didn't catch on fire.
So the question is: do you have an aftermarket stereo? And if so, who installed it? Look at the cigar lighter wires specifically. If I were you, I would pull the fuse block and have a look behind it. If there are wires melted in there, like I had, then you have your work cut out for you.