The Microphone 60 contains 4 wires: positive, negative, ground, and mute. I don't have one in front of me, but attached is an image of one found online for reference, you can somewhat see the wires going into the euroblock, the thread table-60-microphone-pinout also contains the pinout for the Microphone 60. You should be able to contact TAC and they can send you a replacement, another option is you could try and get to the 4th wire and reconnect it to the euroblock, make sure you're connecting the wires in the correct order to the euroblock.