Wiring harness picture needed for 1993 Nissan Altima. When headlights turned on, stereo shuts off.
Nissan change their color codes on their harnesses all the time , a diagram won't be much use.
What has happened is that Nissan has a wire that appears to be an earth in the stereo harness , but goes live when the headlights are turned on ( it is there for the factory stereo to dim the lights when the headlights are turned on.)
Easiest way to connect stereo is to use a Multitester set on 20 volts to find Power , Accessory and earth wires, remembering to turn your lights on and off each time to check for the Nissan sneaky wire. ( You are lucky, I have seen whole looms go up in smoke because of that wire )
To isolate the individual speaker wires, solder a couple of wires to a AA battery and " flash " it across the pairs of suspected speaker wires while listening for a " Crackle " from the speakers, this is a handy way to figure out which wires go to each speaker without having to pull the doors apart to look.
Happy Fixing Marshall
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