I have a 97 ford courier van. I am changing from factory fitted stereo to a pioneer. The plugs fit the adapter but i have no pwer coming to new stereo. Not sure if pins correspond because colour of wires is confusing me. I have 2 smaller orange with black stripes, 1 blue, 1 black with green stripe and 1 larger black with green stripe. Help please

daz, March 2011