by Bushwalker8 on Mon, 29 Apr 2019 8:34 +0000
The USB isn't intended to charge phones, it's not part of the vehicle power circuit. It's primarily an input connected directly to/from the Fujitsu head unit - which does provide a trickle back down to the device to keep it alive while it's sending up the media files.
Best to use the DC outlet which is designed to provide up to 10A and plug in a cheap USB charger.
As explained you can also add another socket, in my SR I added the additional Toyota OEM socket as provided with SR5.
** However be careful with the vehicle wiring here! The lilac colored wiring supplying the acc socket power is special, it's not obvious but the internal conductors are aluminium (not copper) and are NOT compatible with any commonly available crimps or taps, can't be soldered and are easily damaged.**
I ran in a separate fused power source that supplied the second socket as well as some others in the back seat area for charging other devices.