A friend of mine was having some serious trouble with his 2000 mustang audio system. Randomly shut off and sometimes wouldn't have any sound at all. Come to find out the factory amp had been bypassed and multiple speakers wired in parallel to one speaker output. Multiple short runs of short speaker wire were used to make a full run as well causing shorts along the way. Decided the best thing to do was a complete rewire. Take a look.
Before rewire
Stuff that was removed
After
Everything is working well now and as it should after getting rid of improper wiring and shorts.