How do i fix the melted wire mass

SOURCE: alternator wire that runs to the fuse box melting.

if you have a salvage yard near you go there and find a durango with the same engine as your cut those wires of and your and then rewire it look at the dodge rams as well.

SOURCE: what is the black plastic box on top of the

BUY a CHITON, it will tell you all you ever wanted to know. Anyone working on there care should have this. It is essential.

SOURCE: need a stereo wiring diagram for my van.

Yep!
Here you go...
1995 Mercury Villager Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Green/Purple
Radio Ignition Switched 12V+ Wire: Yellow/Black
Radio Ground Wire: Black/Light Green
Radio Illumination Wire: Green
Radio Dimmer Wire: N/A
Radio Antenna Trigger Wire: N/A
Radio Amplifier Trigger Wire: N/A
Front Speakers Size: 5′ x 7′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Orange/Light Green
Left Front Speaker Wire (-): Light Blue/White
Right Front Speaker Wire (+): White/Light Green
Right Front Speaker Wire (-): Dark Green/Orange
Rear Speakers Size: 5′ x 7′
Rear Speakers Location: Side Panels
Left Rear Speaker Wire (+): Light Brown/White
Left Rear Speaker Wire (-): Light Brown/Yellow
Right Rear Speaker Wire (+): Light Brown/Green
Right Rear Speaker Wire (-): Brown/Pink

That's what they show for factory
K

SOURCE: Fusible link wire gets really hot.

Removing the two smaller wires stops the exciter current to the alt which stops it charging.
Usually if a wire is getting hot its because:
A: Current overload..
B: Corrosion in wire restricting current.
C: Corroded terminal.

SOURCE: 1998 passat.i have a blue

check if the wire on the starter is fallen off or burnt.It might be touching on part of the chassis or engine and shorting when you try start the car.Is the engine turning over? Put the car in 3rd gear and try pushing it to check if the engine is not seized.If the engine is seized the starter wire will heat up as the starter will not be able to turn the engine.