Live 12v Feed for USB outlet

[BSR67]

Maybe slightly overkill but my solution was to fit a small auxiliary fuse box under the seat. Rear brake light feed powers a relay with main 12v supply directly from battery. 

I now have independent circuits for spot lights, usb charger and a 12v socket for powering my tyre inflator.

Trebus,

Are you able to post a photograph of how this is wired in please? I need to do the same.

Thanks

BSR67