Zodiac
model(s)	wire color	pin number
M-5026	Audio	1
	Ground	4
	N/C	n/c
	Common	2
	PTT	3
	receive	n-c
model(s)	wire color	pin number
M-5023	Audio	1
	Ground	2
	N/C	n/c
	Common	2
	PTT	3
	receive	5