I have a 2005 Dodge Ram 3500. The radio is missing. It has the factory infinity stereo with the two plugs on the back of the radio. The one big plug (the main one) then the second plug (small one, i believe it's only used with the infinity stereo for the amp system) Well the second plug is cut and the plug end is totally missing. I've installed a factory radio in the truck connected the big plug, radio turns on but no sound. I'm guessing the second plug needs to be there???/ Does anyone have one of these plugs they cut from a junk yard? Or how can I wire it up to work? In this picture I'm missing the plug on the right hand side, the small one on the left.