USB. That's got me guessing. Thanks for your reply and I look forward to solving our mystery. Bizarrely, my number 4 aux wire is now working, I haven't checked the others, so I've used it for the power box I am fitting. The spare ignition accessory wire is still on zero volts.
I have the same problem. I was attempting to install a power box as in the Casey250 video () using the ignition powered spare wire in the footwell (pink/orange). My direct battery wire in the footwell, which I have connected to my dashcam has correct voltage and works fine. None of the other...