I have a 95 Ford Contour which did not come with a radio. I really do not want to put a fancy radio in it so I bought a factory radio. When it is plugged in, there is sound, but it is very weak even with the volume turned to the max. I have 3 connections to the radio (antenna, a rectangle connection and a square connection). I have 2 additional places for connections on the back of the radio. Is there a connection that turns on the amp????
DJ