Hi, there is a factory wire (red with a black stripe) in your car for illuminating the stock radio. This wire is not to be used in an aftermarket radio, so you need to make sure it isn't connected and also isolate and bare wire with electrical tape. Please let me know if you have questions, and thanks for using FixYa.
1999 Mazda Protege 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/Yellow
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:
6 1/2? Speakers
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Violet
Left Front Speaker Negative Wire (-): Blue/Orange
Right Front Speaker Positive Wire (+): Yellow/Blue
Right Front Speaker Negative Wire (-): Violet/White
Car Audio Rear Speakers Size:
6? x 9? Speakers
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Yellow
Left Rear Speaker Negative Wire (-): Orange
Right Rear Speaker Positive Wire (+): Green/Orange
Right Rear Speaker Negative Wire (-): Green/Black
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