How to kill 12v before fuse block

[Makalu1]

Basic question I should know by now but don't- How do I kill the connection from the house battery to the fuse box so I can work on the fuse box or other systems past it (like the frig) without danger?

I traced an intermittent loss of power to the Norcold frig to a lose connection of the 15amp fuse in the fuse block. I'd like to see if I can just simply crimp something to fix the problem, or replace the fuse block if I need to. It's not obvious to me how to do this.

[dhally]

Just disconnect the hoyse battery ground wire.

[daveb]

At least on my build there is a 40 amp breaker that feeds the fuse block. But I also have a standoff lug where the fuse block taps off of. You could pull that jumper off (provided you have that lug) to kill the fuse block.

[gahamby]

Make sure the house and ignition batteries are separated and lift the house battery ground.
I installed a 100A Blue Sea breaker between my house battery and fuse block so I didn't have to lift the ground lead when I wanted to work on the electrical system.

https://www.bluesea.com/products/718...ace_Mount_100A
This battery isolator enables me to switch the ignition battery out of the circuit.

https://www.bluesea.com/products/718...ace_Mount_100A