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Their are two possible thing that causes your stereo fail to be working.
1. Power supply terminal is not properly attached.
2. Busted electronic component inside the stereo.
Some stereo, when their is busted component inside, it wont turn on. So you better have it check to authorize technician or by your self.
Providing you also ran a ground direct from battery, you need a trigger wire from stereo i usually run off power antenna wire.Some stereos have a seperate amp or trigger wire already coming out you just need to run it to amp.
There are 2 powers for this stereo. The is a constant power (yellow wire) which holds the memory, then there is an ignition power (red wire) that turns the stereo on when you start the car. Some cars you need to run the red power wire to a fuse that only works when the car is turned on, for example power windows. Only run it to a fuse that is equal to the fuse on the back of the stereo ( more than likely 10a). Oh and btw check the fuse on the back of the stereo under the plug. If none of these work you have a bad stereo. Or you hooked up the wires wrong.
THAT SOUNDS LIKE YOU HAVE THE RADIO CONNECTED WRONG.. REMOVE THE ALL POWER FROM THE BACK OF THE STEREO. AND CHECK AGAIN, ONE OF OR TWO OF THE POWER WIRES TO THE ORIGINAL STEREO ARE FOR DIMMING THE LIGHTS NOT TO BE USED AS A HIGHER AMP OPERATION.
yellow lead on car stereo should be going to a permanent live on car stereo wiring loom, (always 12 volts regardless of key being in or out) red lead on car stereo should be going to aux in car stereo wiring loom, (12 volts only when key in and ignition lights on) green lead on car stereo goes to earth to allow you to watch dvds whilst driving (highly illigal whilst driving!) read the manual, if this doesnt work fuse in car possibly gone?