...In my view, First, you need to find out WHY the wire(s) Melted! (a) Fuse is there to 'Fail' and protect the wiring. Looks to me that 'if' there was a fuse on that circuit(s)...That fuse Failed to Fail! And that would happen when the circuits' 12 volts + is 'Shorted' to Ground, With-in the Circuit, BEFORE the fuse, melting the wire, instead of the Fuse, itself. Or...perhaps the fuse was of a 'Too-High' an Amperage, causing the Wire to Melt first! Yes, get the 'Correct' Wiring Diagram, there are 2 or 3, all Different! On these Panteras the Wire 'Colors' are sure to be Different!
...Correct me if wrong, it is my understanding, there is One Circuit(s) on most vehicles, that for 'Safety' Reasons, are NOT fused, and NOT 'Fuse-Linked'...that would be the circuit(s) for The Headlights! NOT the Motors!! But for the Actual 'Bulb Filament', when driving in darkness, for safety there CAN NOT be a fuse that 'Can' Blow!...therefore, as a Last 'Hail Mary', You will have Lights Until the Wire Melts!! It would be about the 'Amperage Draw'. Or, as previously stated, that Wire is Shorted.
Good-Luck
MJ