The classic 1990 Ford F150 pickup truck still has legions of loyal fans. Many of them are looking for a way to upgrade the original factory radio wiring so that they can get better sound from their audio systems, but finding detailed instructions can be tricky.. 1990 Ford F150 Truck Stereo Wiring Information Radio Battery Constant 12v+ Wire: Green/Yellow Radio Accessory Switched 12v+ Wire: Yellow/Black Radio Ground Wire: Red or Black Radio Illumination Wire: Blue/Red Left Front Speaker Positive Wire (+): Orange/Green Left Front Speaker Negative Wire (-): Black/White Right Front Speaker Positive Wire (+): White/Green Right Front Speaker Negative Wire.
![[DIAGRAM] 1990 Ford F 150 Pcm Wiring Diagram](https://schematron.org/image/2004-ford-f150-54-pcm-wiring-diagram-2.jpg "[DIAGRAM] 1990 Ford F 150 Pcm Wiring Diagram")
![[DIAGRAM] Wiring Diagram For 1990 Ford F 150 Stereo Speakers](https://mainetreasurechest.com/wp-content/uploads/2018/07/2000-ford-f150-radio-wiring-diagram-best-of-fresh-1997-ford-f150-radio-wiring-diagram-wiring-of-2000-ford-f150-radio-wiring-diagram.jpg "[DIAGRAM] Wiring Diagram For 1990 Ford F 150 Stereo Speakers")
![[DIAGRAM] 1990 Ford F 150 Pcm Wiring Diagram](http://schematron.org/image/2004-ford-f150-54-pcm-wiring-diagram-10.jpg "[DIAGRAM] 1990 Ford F 150 Pcm Wiring Diagram")
List of elements for Radio Wiring Diagrams for Ford Pickup F150 1990: Batt (b+) C257 C258 Fuse 11 15a Fuse 8 15a G108 (1990) (left side of upper radiator support) G206 (1991) (behind center of dash) Ground Ignition Illum Interior lights system Lcd illum Left front door speaker Left rear speaker Lft frt (+) Lft frt (-) Lft rr (+) Lft rr (-) Not used Radio Right front door speaker Right rear.. If you have the "Ford Premium Stereo" option (my 1989 (F150 4x4 Reg Cab) does) then there is actually a really hard to get to factory amplifier behind the instrument cluster, I left it in there and the new speakers use the factory wiring.