Where can I find a 1993 pioneer DEH-780 Super Tuner 3 wiring diagram?

SOURCE: Pioneer deh-p520 super tuner 3

Black, red, gray and white (for the front speakers only).
Black: Ground
Red: VCC
Gray: Speaker
White: Speaker.
Remember to isolate any unused cable like the blue (remote), green and purple (rear speaker).

SOURCE: pioneer super tuner stereo

You can get the wireing diagram here.

http://www.pioneerelectronics.com/PUSA/Products/CarAudioVideo/Source/CD-Players/DEH-1500?tab=D

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SOURCE: need a wire diagram for pioneer DEH-1100 super tuner

Usually it's....

black = ground
red = switched battery power
yellow = constant batery power (for clock...etc)
orange = illumination
blue = amplifier turn on or accessory (electric antenna, amps etc)

green/white/purple/grey are speaker wires.

SOURCE: I need a wiring diagram for Pioneer WMA/MP3 Super

Here it is...