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Weelawser

Yellow wire on Stereo harness

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Does anyone know what the yellow wire on the stereo wiring harness is for ? Fitting after market Sony Head Unit and that is the only wire as in the attached pic that I can't figure out where it goes ?20190721_155214.thumb.jpg.1e8ad85f22cbbd66bb3346c46a5ae448.jpg

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Red and yellow are usually used for "always live" and "live when ignition is to AUX or RUN".  It can be either way round, depending on the car manufacturer.  This was explained in the instructions which came with my Sony head unit, and the Sony-provided harness had an arrangement to do a crossover if needed.

Just check which way round your car is with a multimeter or test lamp.

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