[throwingcopper33]

I have a 2018 BMW 440i Gran Coupe F36.

I hardwired the BlackVue B-124 battery to the rear fuse box in the trunk. I had to use a fuse tap that BlackVue sends with the packaging box. I wanted to tap into a fuse that only had power when the ignition is turned on. But unfortunately, I could not find any in the rear fuse box. The fuses in the rear fuse box are either:
1) always powered
2) powered for 15 minutes if triggered(like opening a door, or unlocking your car, etc)
3) powered when switched on(pushing the start button without pressing on the brake pedal)

The first two were not an option for me, as the BlackVue battery charges at 9 amps when hardwired. I don't want my main car battery to be charging the BlackVue battery at 9 amps even if it is only for 15 minutes. So that covers about 90% of the fuses that I cannot use.

And because you have to tap into a fuse that is over 10 amps, there was only one fuse that I could really use. That was fuse 145 which is a 15 amp fuse. Fuse 145 is the only fuse above 10 amps in the rear fuse box that is powered when switched on.