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Why do you want to put all the speaker on a common ground? If you tap into the wiring loom to the amp (or find an adapter) you should be able to take off all 8 wires to the dash and door speakers and route them back to your head unit. I can tell which wires to tap into it you still need this info.
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2003 Boxster S
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2003 Porsche 986 3.2s Tiptronic
Threaded Mode
