Well i just cant seem to get the radio to work on my 94 grand. I put 2 decks into the factory wiring harness i hooked up the ground wire and aerial. Every thing turns on on both decks like i took the deck that was working fine from my dads 96 grand and put it into the 94. Every thing lights up and looks good minus no sound not even static any ideas? even CD wont play but the deck makes noises like its trying to play

 

Are you sure there are speakers installed in the vehicle?
If there are, maybe they're blown?
Check speaker wires for shorts or cuts.

 

Did this vehicle have the Infinity premium stereo in it from the factory? If so, there is an amp under the back seat that makes things complicated when installing an aftermarket deck.