I'm looking at the fuse box in the trunk, and i need to figure out which fuses have a constant 12v power source. Im new to this, so if i can avoid it, i dont want to use a multimeter to test every fuse.
My stereo has the constant power problem where it loses presets and EQ settings every time i turn on the car, so im trying to figure out a power source.

So my question is:
which fuse is 12v constant, always powered? would there be one under the hood that's more convenient to use?
Also, if i do figure out a good place to use, HOW do i wire it? there are wires going up to the fuses, do i just crimp it with a wire going to the stereo?

Thank you!