Audio Systems: 1990 ford ranger, liabary, radio shack

Question
Where can I find a factory color code guide for a 1990 ford ranger to attach my aftermarket radio?  It has 14 wires and I have no old radio/harness to compare.

Answer
Phil,

  if your factory plug is gone and you cant purchase a wire harness adapter plug from radio shack .. the best place to get a harness schematic is from a haynes repair manual about 10-15 bucks from local auto parts store or check at the liabary.. if it had been a late model GM i have one on the net in PDF format .. hope this helps you out if you need anything else let me know ...

thanks