I am guessing based on the car you called out and the pics.
Black wire burned out.
Traces back to the alt.
So your main power circuit feed ate itself.

Either your amp meter died, alterator died with a dead short, or that was melting all along from not being maintained/cleaned and finally burned through this last time.

the light and not being able to start are burned wiring or connections.

you need a new engine harness and dash harness if you can't trouble shoot the wiring yourself.

http://www.mymopar.com/index.php?pid=27

will give you the diagrams you need to see where the wiring goes and wire in new ones or pop out the harnesses and start again with new connectors.