I bought a new Pioneer stereo for my truck, hooked it up, and no sound comes from the speakers! I hooked my factory unit back up...everything works fine. I don't think I have the Infinity system, as nothing has the name on it anywhere. What the heck is going on??? The wires ar eall hooked up as they should be...

 

Nevermind, folks... I hooked up the blue wire to some power and everything works fine... Don't know why I would need to hook up the blue one, but, oh well, it works...