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Im using the stock system. But want a new head unit. Is it only the adapter cable you needLikely this is head unit->equalizer->trunk mounted amps->new speaker wires->new speakers. Meaning none of the stock wiring is used.
There are adapters for the stock head unit wiring, but if you are putting in a full system (instead of just a head unit running non-JBL stock speakers), you just need to tap always-on 12V, key-on power, and antenna wire.