I have changed dozens of head units in my cars without any problems. I decided to upgrade the JVC KD NX5000 in my 2010 Roadster with the Pioneer AVH-3500NEX. It has a fold out LCD screen and CarPlay and a Back Up camera. I ran the back up camera wires through the passenger side channel alongside the frame as shown in the Tesla manual. The problem I find is that all of the speaker wires in the loom are the same color code -- blk/white. How do I determine which wires go to which speakers? Also, I don't find an amplifier, but the car does have a sub. Any suggestions would be greatly appreciated.