For those of you who have a cobra 2000GTL, here are schematics, mic wiring and parts lists for your reference.
Mic Wiring
Stock
1- Audio
2- Shield
3- Receive
4- Sw Com
5- Transmit


Astatic (4 wire)
1- White
2- N/C
3- Black
4- Shield
5- Red


Astatic (6 wire)
1- White
2- Shield
3- Black
4- Blue
5- Red
Yellow N/C


Daiwa EM-500
Cobra CA Series

1- Red
2- Shield
3- Blue
4- Black
5- White


Galaxy DC-521S (4 wire)
1- Yellow
2- N/C
3- Black
4- Shield
5- Red


Galaxy CB-660EI
1- White
2- Shield
3- Blue
4- Black
5- Red


Sadelta
1- White
2- N/C
3- Green
4- Shield
5- Brown

Turner
1- White
2- Shield
3- Black
4- Red
5- Blue
Yellow NC

cobra_2000gtl_om_counter_sch.pdfcobra_2000gtl_om_part_list.pdfcobra_2000gtl_om_main_sch_11x17.pdf