Glad the diagram is useful for some of you.
The info contained in the diagram came from a Haynes manual and my own car.
Just for a little clarification, the WHT (White) wire going from the factory HU to the factory amplifier carries the signal to turn the amp on (I have not checked this myself since I replaced everything).
I'm not sure what the "Door Lock Module" connection is for.
The color codes that Ford uses for the speaker connections will probably not match those of most head units, so here are the standard EIA codes:
12 Volt Switched (Ignition)...RED
12 Volt Battery (Always on)...YELLOW
Ground........................BLACK
Power Antenna.................BLUE
Amp Turn-On...................BLUE/WHITE
Illumination (Dash Lamps).....ORANGE
Dimmer........................ORANGE/WHITE
Speaker Connections
+ Right Front.................GRAY
- Right Front.................GRAY/BLACK
+ Left Front..................WHITE
- Left Front..................WHITE/BLACK
+ Right Rear..................VIOLET
- Right Rear..................VIOLET/BLACK
+ Left Rear...................GREEN
- Left Rear...................GREEN/BLACK
-Wes
98 SE Sport
