How do you wire an old Motorola deskmic

[5xray792]

I picked up an old old Motorola desk mic and the cord was shot. I replaced the cord and pinned it for my Pres Washington. The problem I'm having is the mic itself. I was able to key it up and get audio but when I key up it squeals like crazy. Does anyone know the wiring for the old Motorola mics. I check the head its fine. PLEASE HELP!!!!!

Dave 5xray792

[MDYoungblood]

If the Washington is a 5 pin model the TX/RX common lead needs to be separate from the microphone's negative lead. I'm not sure how that mic's PTT switch is setup.

3's

Greg