can anyone tell me which pin connects to 12 volts, which one is ground, r.f. speaker +&-, etc...

 

I'm about to email you back about that harness.

At any rate, the wiring codes are usually stamped right onto the side/bottom of the radio somewhere.

 

unfortunately, the plate on the bottom of my radio is from an 87 radio, so the diagram is different. it is an iroc 89 extended range soundsystem stereo though.

 

It should be a standard GM Harness. Do you need the actual pinouts or the color codes for the wiring harness?

Color code:
Yellow - Key switch power
Orange - Constant 12V
Brown - Illumination (dimmer)
Pink - Power Antenna
Gray - Panel Light
Light Green - -Right Front
Dark Green - +Right Front
Tan - -Left Front
Grey - +Left Front
Brown - -Left Rear
Yellow - +Left Rear
Dark Blue - -Right Rear
Light Blue - +Right Rear
Ground - Black

 

i need the pinouts, my harness is gone and im trying to make my own, but no one seems to know which pin on the radio goes where.

 

You can order aftermarket harness that replaces the one that is in the vehicle. That's what I had to do in my '83 since someone ripped out the orginal harness.

Basically you can match up the wires color code on the bag that comes with the harness and, presto, you have a orginal hardness in the vehicle.