in a Haynes or Chilton manual you can get at a auto parts store or online
This website has a lot of wiring for many cars including '92 Eclipse. http://www.modifiedlife.com/1992-mitsubishi-eclipse-car-audio-wiring-diagram/
Try PAINLESSWIRING.COM
Wiring diagram for instalation
go to __the12volt.com __aojedam
for a stereo? go to the12volt.com
I would Invest in a Haynes Manual.
http://www.installdr.com/Harnesses/Mitsubishi-Wiring.pdf
go to the12volt.com and enter your vehicle info
http://www.the12volt.com/installbay/stereodetail/1541.html
http://www.mitsubishisucks.com/cars/bulletins/usa/parts/electrical/eclipse.html
You can buy a Haynes manual at Autozone. There is wiring diagrams and other trouble shooting things in the book.
The Chevrolet Cavalier CD player wiring diagram shows the beginning location of each wire and the ending location of each wire. The diagram is handy when diagnosing problems.