GENERAL ELECTRIC
model(s) wire color pin number
cb-7 Audio 2
fcb-27 Ground 1
  N/C n/c
  Common 1
  PTT 4
  receive n/c
model(s) wire color pin number
cb-4 Audio 1
  Ground 2
  N/C n/c
  Common 2
  PTT 3
  receive 5