Mechanics

NO TAIL / RUNNING LIGHTS WOULD COME ON

1998 Nissan 240SX

I HAD A CAR STEREO INSTALLED YESTERDAY. THE FIRST TIME I TURNED MY HEAD LIGHTS ON AFTER THE INSTALLATION, I REALIZED THAT NONE OF MY TAIL / RUNNING LIGHTS WOULD COME ON. THE HEAD LIGHTS ARE FINE AS ARE THE BLINKERS AND BRAKE LIGHTS. PLEASE HELP ME. I ALREADY CHECK/REPLACE THE 10AMP FUZED
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Beverlyfernandez
September 21, 2012.




Was that fuse blown? Tail lights and dash lights both have circuits that branch off and go to the original radio, one to dim the display when the head lights are turned on and one to tell the display how much to dim. Very often radio installers will measure the resistance on the wires to figure out which one is the ground wire. Both of those lighting circuits WILL measure very low, like a ground wire, due to the many bulbs on them. If the installer used one of them as the ground for the new radio, that light circuit will be shorted to ground through the real ground wire and / or the antenna cable. One potential clue to this mistake is the radio will not play properly if you turn the head lights on and turn the dash lights to the full brightness setting. It doesn't matter that those lights aren't working, but it will matter which incorrect wire they used.

Caradiodoc
Sep 21, 2012.


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