Where can I go to get some information on wiring a sound system into a specific vehicle? Something that covers everything, like how to get to the radio, factory amplifiers, a place to run wire from the inside of the car to the battery, etc. I've been thinking of buying a crutchfield master sheet or whatever it's called, but free would definitely be better.
I know autozone offers something of this nature, but I was wanting something a little more detailed and easy to comprehend.
I drive a 1995 240sx, if that helps anything.