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Head lights make the radio come on and , i have to unhook the cd player from the harness to cut off the parkinking and tail lights

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On the back of the stereo (assuming it is an aftermarket unit) there are only 4 wires that deal with power.
Black- Ground
red- 12V+ turns on with the key
yellow- 12V+ always on
orange- illumination circuit,

the orange wire is most likely hooked up, it is intended to change the brightness of the radio when you turn on the headlights, however it always causes problems, best bet is to disconnect the orange wire, you do not need it, i am 99% sure it will not change the function on the lights on the deck.
dash lighting in cars runs on reverse polarity so a dimmer circuit can be used on a DC power system. the radio does not understand this and it causes strange issues like this one, give it a shot, please let us know how it goes.
thanks
JCC

Posted on Apr 26, 2008

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