radio

i have a 1999 f250 super duty w/ a 7.3 diesel , my problem is the last time i drove my truck the radio was working, next time i turned it on the radio , tape an clock does not come on. i have tested all fuses an are ok. the radio is a f87f-19b132-ab . i can not find a diagram to even find which wires are the 12 v and ground  and speaker inputs to it, although i think the radio is the problem.  

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jim

Is it just the display that does NOT work? Is there sound? Lights on but no ones home? Or does the entire unit not work?

These units are well know for this problem. (the display going south)

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+12V DC Battery(Constant)	Lt.GREEN/ violet	Also goes to CD player, pin 9	1	15 Amp	Junction box under left side of dash
Switched Accessory	BLACK/ pink	Also RED / black for hot in start with fuse no. 20 of 5 amps	8	5 Amp	Junction box under left side of dash
Ground	Black & BLACK/ light green
Illumination	Lt.blue/red
Left Front +	ORANGE / lt.green
Left Front -	Lt.blue/white
Right Front +	WHITE/ lt.green
Right Front -	Dk.GREEN/ orange
Left Rear +	Tan / YELLOW
Left Rear -	Gray/lt.blue
Right Rear +	BROWN / pink
Right Rear -	ORANGE / red

AT SPEAKERS

Wire Function	Color	Note
Left Rear Mid +	Tan / YELLOW	Or BROWN / pink
Left Rear Mid -	Gray/lt.blue	Or ORANGE / red

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there is no display, everything is dead no tape, no radio. an fuses have been checked

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jim

by the way what is the switched 12 volts for?

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jim

that is so the radio only has power when the car is on on or run and cannot work while the car is off. the radio needs to see 12v constant and 12v accessory in order to come on.