GE Mic wiring

I found an old GE EA68X124 mic while hunting for some coax. Hooked it to my 29LTD and nothing, I keyed the mic and could hear the radio so I'm assuming it's not wired for a cobra. I can't find any wiring info for the GE so I'd appreciate any help.
The pinout now is...
1: orange
2: shield
3: grey
4: blue