What are the black and orange wires for on a Dual Xdmr7700 stereo?

Change the Flex cable that connects from main chassis to the front face plate. This is a common problem with Dual drop down face plates, since the flexible wires break and lose connection.

1990 Ford Thunderbird Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Black/Light Green
Car Radio Illumination Wire: Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: Orange/Blue
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5′ x 7′
Car Audio Front Speakers Location: Doors
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 (-): Black/White
Car Audio Rear Speakers Size: 5′ x 7′
Car Audio Rear Speakers Location: Side Panels
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

Here is your stereo wiring
1989 Ford Thunderbird Car Stereo Wiring Diagram
Radio Battery Constant 12v+ Wire: Green/Yellow
Radio Accessory Switched 12v+ Wire: Yellow/Black
Radio Ground Wire: Black/Light Green
Radio Illumination Wire: Blue/Red
Stereo Dimmer Wire: N/A
Stereo Antenna Trigger Wire: Orange/Blue
Stereo Amp Trigger Wire: N/A
Stereo Amplifier Location: N/A
Audio Front Speakers Size: 5′ x 7′
Audio Front Speakers Location: Doors
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 (-): Black/White
Audio Rear Speakers Size: 5′ x 7′
Audio Rear Speakers Location: Side Panels
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

Here you go:

http://www.autotoys.com/pdf/xdmr7700.pdf

What part is missing? Is it just the faceplate, or the gear mechanism as well?

I have one of these that the ribbon cable is bad and can't seem to find a replacement. I am debating just buying a new stereo. If i do, I could sell you the faceplate. email me at rad73082 (at) yahoo

this is what I show for Passat.
Car Radio Constant 12V+ Wire: Red/White
Car Radio Ignition Switched 12V+ Wire: Orange
Car Radio Ground Wire: Brown
Car Stereo Illumination Wire: Gray/Blue
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amplifier Trigger Wire: N/A
Front Speakers Size: 6 1/2′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Blue/Black
Left Front Speaker Wire (-): Orange/Black
Right Front Speaker Wire (+): Red/White
Right Front Speaker Wire (-): Orange/White
Rear Speakers Size: 6 1/2′
Rear Speakers Location: Rear Door
Left Rear Speaker Wire (+): Red/Light Green
Left Rear Speaker Wire (-): Orange/Black
Right Rear Speaker Wire (+): Blue/Light Green
Right Rear Speaker Wire (-): Orange/Red

Black is obviously ground. red is for switched power (only has power when vehicle is on) single yellow or orange is constant power Dual grey and dual white (solid grey/grey with black) and dual etc. are for speakers. the blue is for accessory power for amps and eq's. on the speaker wires the one with markings is for + and the soild is for -.

here is wire color diagram.
1994 Ford Explorer Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Light Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: Orange/Black
Car Stereo Dimmer Wire: Light Blue/Red
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Blue
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Orange/Light Green
Left Front Speaker Negative Wire (-): Light Blue/White
Right Front Speaker Positive Wire (+): White/Light Green
Right Front Speaker Negative Wire (-): Pink/Light Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Pink/Light Green
Left Rear Speaker Negative Wire (-): Tan/Yellow
Right Rear Speaker Positive Wire (+): Orange/Red

1994 Ford Escort Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Red
Car Radio Accessory Switched 12v+ Wire: Blue/Black
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red/Black
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Violet
Left Front Speaker Negative Wire (-): Blue/Orange
Right Front Speaker Positive Wire (+): Blue/White
Right Front Speaker Negative Wire (-): White
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White/Blue
Left Rear Speaker Negative Wire (-): Red/Blue
Right Rear Speaker Positive Wire (+): White/Green
Right Rear Speaker Negative Wire (-): Blue

PLEASE RATE THIS INFO AS A FIXYA! IF YOU FIND IT IS WHAT YOU NEED, THANKS ALLOT.
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2004 BMW 330i Car Radio Wire Diagram
Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: Violet/White
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Yellow/Red
Left Front Speaker Negative Wire (-): Brown/Orange
Right Front Speaker Positive Wire (+): Black/Red
Right Front Speaker Negative Wire (-): Brown/Orange
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Yellow/Black
Left Rear Speaker Negative Wire (-): Black/Orange
Right Rear Speaker Positive Wire (+): Blue/Black
Right Rear Speaker Negative Wire (-): Black/Orange

pls rate