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Go over the steps in this link. You can account for each wire needed and you can see where the blue wire goes. In most of the stereo's I have installed the blue wire is either memory wire or ground wire.
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1994 Mazda Protege Car Stereo Radio Wiring Diagram Car Radio Constant 12v+ Wire: Blue/Red Car Radio Switched 12v+ Wire: Blue/White Car Radio Ground Wire: Chassis Car Radio Illumination Wire: Red/Black Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Front Speakers Size: N/A Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Blue Left Front Speaker Negative Wire (-): Blue/White Right Front Speaker Positive Wire (+): Blue/Red Right Front Speaker Negative Wire (-): Blue/Yellow Rear Speakers Size: N/A Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Blue/Red Left Rear Speaker Negative Wire (-): Blue/Green Right Rear Speaker Positive Wire (+): Blue/White Right Rear Speaker Negative Wire (-): Blue/Green
Here are the colours of the factory radio harness and what they do. 1995 Toyota Camry Car Radio Installation Schematic Car Radio Battery Constant 12v+ Wire: Blue/Yellow Car Radio Accessory Switched 12v+ Wire: Gray Car Radio Ground Wire: Brown Car Radio Illumination Wire: Green Car Stereo Dimmer Wire: N/A Car Stereo Power Antenna Trigger Wire: Black/Red Car Stereo Amp Turn-On Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Tweeter Size: N/A Car Audio Front Tweeter Depth: N/A Car Audio Front Tweeter Location: N/A Left Front Speaker Positive Wire (+): Pink Left Front Speaker Negative Wire (-): Purple Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Blue Left Rear Speaker Positive Wire (+): Black Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Red Right Rear Speaker Negative Wire (-): White
it sounds like you are going through an external amp. try using the blue/white wire instead of the blue wire. the blue wire is antenna remote turn on. the blue/white is amplifier remote turn on. the blue wire turns off when leaving tuner mode.
A stereo or amp, either one should have a fuse, fuses for radios would be in the wiring harness behind the radio deck. An amp fuse should be obvious were they insert in the fuse blocks by the amps main power cable connector. If you see that all fuses are fine then check your ground wires if not then your radio is bad.
First you need to go to Schoche.com and Purchase a Small Blue Box that will let you convert the Audio wires into RCA Jacks. Got one for my 2007 Scion Xa Worked Great! You will still need to run your wires for the amp and Run RCA Cables to the Stereo. This box will cut into the Rear Speaker wires and still allow the Speakers to work while allowing you to Connect the RCA Cables for the Amp to the Box.
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