On the z32 afm above the plug should be letters or numbers.
Mine had the letters a,b,c,d,e,f.
a & f are not used.
b = 'Signal' so join it to orange/blue
c & d = 'ground' and 'signal ground', so splice them together and join them to the white/blue
e = '12v' so join it up with the black/white.
I would advise checking with a multi meter first though in case different models are wired differently.