i'v just connected my rca's to an amp and have no sound what so ever, this unit used to be hooked up to the same amp but have been running it direct to speakers recently not through the rca's... (only recently decided to reinstall my amp) , i have conected the blue/white wire for the remote wire, the red is to ignition, the yellow is to power and the black to chassis... is there any others i need to connect and where too? thanx