so i've decided i'm going to hardwire everything in and bypass both front and rear amps.
the bypassing part is easy. i just need to run speaker wire from where the amps were and hook them up to the aftermarket radio.
it is getting power to the radio that i am unsure of.
the 5 pin connector in the dash that connected to the radio is my issue. the wire colors are black, grey, red, blue and green. i assume that red is 12v hot, black is ground and blue is power antenna. i do not know what the grey and green wires are for. i also do not want to wire a radio based solely on assumptions since factory wire coloring is not necessarily the same as aftermarket
there is also another black wire separate from the 5 pin connector, along with yellow (constant 12v for clock i presume) and orange (light for the head unit which i do not need.)

i would just assume wire blue red, yellow and black and then the speakers but since there is a separate black that does not go into the 5 pin connector i do not want to use an incorrect ground.

does anyone have any insight here?