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You should have the M100 series connectors (dual Gray & Black 8pin bars), Ford has several types, start on this site: http://oem-auto-accessory.com/photo_page.html to make sure. The wires should be:
Memory (+12v Constant)Green/YellowIgnition (+12v Switched)Yellow/BLKGround (-)Thick Red/BLKIlluminationOrange/BLKDimmer/Headlamp+12vBlue/WhiteS p e a k e r sRight Front (+)White/GreenRight Front (-)Green/OrangeLeft Front (+)Orange/GreenLeft Front (-)Light Blue
Rear speakers will not likely be used in the 1990.
Source (Modified by author): http://ccs.exl.info/carwires.html#FORD
Ford factory diagram/schematics: http://www.ford-trucks.com/forums/884257-1990-f250-radio-wiring.html
Here is a site that shows the general wiring for aftermarket attachment:
http://www.installdr.com/Harnesses/Ford-Wiring.pdf
A complete flow of diagnosis for any console radio wiring problem:
http://www.the12volt.com/installbay/forum_posts.asp~TID~74637~PN~1
--Author Note: My 1990 F150's m100 power buss connector includes: (GRN/YLW): Constant Power/Unused/(YLW/BLK):12v+ Switched/(Blu/YLW):Headlamp Switch+12v/(ORNG/BLK):12v+ Switched/(Red/BLK):Ground/Unused/Unused--
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