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Vehicle is V40 - 2004 - 4 front speakers (door and dash), 2 rear speakers plus a dual rear speaker) for 7 total speakers. I think this is audio level 2.

I have just replaced my factory HU with a JVC Arsenal KD-A815 aftermarket HU

The harness I used is this one: Wire Harness

Also got the antena adaptor.

Everything hooked up easily and okay, but now, only 2 front speakers (dash) and 2 rear speakers are working. The 2 in the front door, plus the dual one in the rear are not working.

Did I get the wrong harness ? Do I need one where there are 'cross over' wires from the green to the grey plug? Do I need an AMP?

Any help would be appreciated.


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