Hi @viofo
I also tested the dash cam with an usb power adapter with an output of 5v / 2Afrom the 12v socket and it worked without any issue.
Back to my initial dilemma, I think the dash cam should power on from the USB socket as it can supply 5v / 1.5A. I just wanted to use the USB socket...
My VIOFO A139 does not power on from the 1.5A USB car socket.
I can't use the HK3-C kit because all the fusese from the car are hot (I have a Mazda CX-30) and I also don't want to go through the firewall.
I didn't want to use the 12v socket because is in the arm rest, but for the moment this...