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I hope this helps someone. I have a 1993TT with a Bose system. My stock radio harness for the Bose radio system was cut, so I had to buy a Scosche interface and splice it in(BUY it at Crutchfield.. great free tech support if you need it. I could not find a good diagram under the search function so I thought I would post this to help somone in the future. My Service manual was not the easiest to read. STOCK -SCOSCHE WHITE -WHITE LF+ SOLID BLACK -WHITE/BLACK TRACER LF - WHITE W RED STRIPE -GREY RF + BLACK WITH RED STRIPE -GREY/BLACK TRACER RF - BLACK (GROUND) -BLACK (GROUND) YELLOW -RED BLACK / RED STRIPE -BLUE (POWER ANTENNA) RED W/YELLOW STRIPE -ORANGE SOLID BLUE -YELLOW ORANGE -BLUE/WHITE TRACER Illumination BLACK (GROUND) -BLACK GROUND WHITE W/ BLUE STRIPE -GREEN LR + BLACK W/BLUE STRIPE -GREEN/BLACK TRACER LR - WHITE W/ GREEN STRIPE -PURPLE RR+ BLACK W/ WHITE STRIPE -PURPLE/BLACK TRACER RR - There are two Black wires with Red strips. So in order find out which one is the Right Front negative speaker wire, connect the White wire with the red strip to the positive side of a AA battery, and take the Black wire with the red strip to the negative side of the AA battery. If it is the correct Black wire with a red stripe, the speaker will make a POP noise and you will know you have the correct wire. I hope this helps someone...
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