hardwiring into the fuse box

So i cannot connect directly to 12v supply when wiring? cut usb cable and wanted to Connect directly to 12v accessories but no power at all. Do I Need to convert 12V to 5V in order to work?

Hi awesome guys, I recently hardwired my Dashcam (Kingslim 4K), and I think the internal battery in no good. Whenever I turn on the engine, the battery power falls and the dashcam enters the parking mode and stops recording. I have to manually turn it on. It will stay on till I start the car...

1st picture is my car's fuse panel layout. Does it seem like fuse #15 is the best option with 20A? Or which fuse would you recommend instead? 2nd picture is the Blackvue B-124X external battery's specs. I'm using this battery pack to power the BlackVue DR750-2CH LTE. Also, the fuses are...

1st picture is my car's fuse panel layout. Does it seem like fuse #15 is the best option with 20A? Or which fuse would you recommend instead? 2nd picture is the Blackvue B-124X external battery's specs. I'm using this battery pack to power the BlackVue DR750-2CH LTE. Also, the fuses are...

Hello folks I just purchased the Cellink NEO 9 Dash Cam Battery backup to use with my Black Vue 900X camera. Problem is do I use a constant 12V power supply from the cars fuse box and then connect the green cable from the cellink 12V into the switched 12V on the cars fuse box, I take it doing...