Radio install driving me CRAZY

[tjgp360]

I have been trying to find the 12v wire and the ground for HOURS ...has anyone ever wired a aftermarket radio in place of the stock in a 79 cordoba?

i have tried all of the wires that were attatched to the old radio but none of them work.

 

[Satellite65]

One of 'ems gotta work. Did the factory radio work before you pulled it out? Maybe you popped the fuse.

 

[tjgp360]

the old radio worked before i unplugged it, and i checked all the fuses, im totally lost. ground is the black wire right? nothing happens when i use the the wire OR the body as a ground, which wire is the 12v? because i know for a FACT that i get power from the back of the fuse box so power is there somewhere but none of the wires work for me unless im doing somthing wrong

 

[Propwash]

Black is typically ground in most 12 volt senario's

(A) Get a hold of a wiring schematic
(B) get a 12V hot wire tester, check to see the wire you want has power
(C) Hook a generic 12V positive (ex...cigerette lighter wire) and a ground to the new radio to insure it works.