Im cleaning up a old cobra 29gtl i picked up that seems to work really well. It has 4 pin mic jack. Im yrying to use my d104 desk mic which is wired for 4 pin and works on my galaxy949 and 2950dx (with adaptor). Does it need to be wired differently for the older 4 pin cobra? Also what baffles me is the stock galaxy 4 pin mic works on the cobra, just not the d104. Its like there is no mic plugged in when i try it.