In my 1996 MK VIII the radio was not working, therefor purchase a new JVC KW-XC410. I believe that I have hooked up the Scosche FDK10B/FDK 10 color coded wireing correctly. The radio is on, antenna goes up and down, volume shows, stations show, but no sound coming out of the four speakers. I have not been able to find the amplifier in the trunk or under the dash. I assume the radio was standard audio system, with out a cd player, etc. Need help.