I just installed a new stereo in my truck and hooked the wires according to the schematic. The factory radio shows what wires do what so I hooked them accordingly through the factory harness and I still don't get any sound. Is there another ground or something that I'm not aware of. Thanks

Most Dodge cars and trucks used a separate ground that bolted directly onto the back of the radio, i.e. was NOT in the wire harness. Does the radio light up? If so, it's most likely not a ground issue. More info would be useful...