IC47.1

ON THE IC-27/37/47 RADIOS, ON THE BOTTOM SIDE OF THE RADIO, JUST UNDER
THE AREA OF THE SPEAKER,  IS A TWO PIN CONNECTOR WITH A GREEN AND RED
WIRE ATTACHED. THE GREEN WIRE IS SPKR AUDIO AND THE RED WIRE IS +8 VOLTS.

BY CUTTING THESE WIRES AND ATTACHING THE GREEN WIRE TO THE HIGH SIDE OF
THE VOLUME CONTROL  AND  ATTACHING THE RED WIRE TO SWITCHED 12 VOLTS
A TNC CAN BE WIRED TO JUST THE MICROPHONE CONNECTOR AND MAKES A CLEAN
INSTALLATION PROVIDED THE RADIO IS DEDICATED TO PACKET.