Ok I swapped over my standard BMW sterio harness with the slide plug on thE end. Now I copied from the wiring from my car, matched up wires with new plug. But only to be left with extra wires??? There the speaker kind of wires. Not sure what year the new harness came from , but it had pin 7 in already which is ibus .. Which I needed. Just wondering what to do with extra wires??? Is this why I get radio interference when turn hids on??? Also get the same when I put on DVD headrests??? Please help sort this issue?