03silverevo

Ever since i have got my car the left marker lamp has not worked. Well blub and everything is fine. Tested power on the wires and the plug under the car is getting power and the wire going to the blub doesnt. Well i followed the rest of the wiring that goes to the other marker lamp and licence plate lights the wire looks like it has been melted by something. Does anyone have a clue what i can do? Or am i going to have to go to the dealer and get he entire new wiring harness for all this?