GMC C3500 HD (1991-2000) 2-speaker system circuit

ANTENNA ANTENNA INPUT BLK WIRE BRN WIRE COAXIAL CABLE CTSY FUSE DK GRN WIRE FUSE BLOCK (UNDER LEFT SIDE OF DASH) GRY WIRE HOT AT ALL TIMES HOT IN ACCY OR RUN IGN MEMORY(BAT) LEFT FRONT SPEAKER LT FRT SPKR LT FRT SPKR RT FRT SPKR RT FRT SPKR GROUND PARK LAMP DIMMER LT GRN WIRE ORG/ WIRE RADIO RADIO FUSE RIGHT FRONT SPEAKER TAN WIRE YEL WIRE