Just got another Heil HMM this one was wired for a 6 pin I believe Icom the guy sad he thought anyways. What I wanted to do was wire it standard Uniden 4 pin so I could use my adaptors I make to run it with Yaesu Kenwood RCI Cobra ETC foor experimenting with these other radios I wired it up straight to Kenwood 8 pin for now to test that it worked so I could leave feedback on the seller. The mic sounds great on my Kenwood TS-50 so I left the appropriate feedback for the seller. Problem is this, I wanted the 4 pin plug as I explained but it simply would nnot work!! There is 4 wires only and they are Black, Red, Yellow and Shield. I wired it Pin 1 Shield, Pin 2 Yellow, Pin 3 Red, Pin 4 Black this did not work. When plugged in to my Kenwood with adapter the radio keyed I believe and the PTT button did nothing. I switched the Red and Black wires and this did nothing. When I plugged the heil into my RCI 2950DX with the 6 to 4 pin adapter the frequency went screaming downward. I know the adapters work because Ive used them for years now and on a daily basis anyone have any idea?? I contacted Heil lastweek and have heard nothing.