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That nut is always hot - fed from the 350 amp fuse on top of the battery.
From reports the nut is hard to remove without breaking the fuse box.
Why not slip a ring lug over the stud and add another nut? Be sure to fuse your new circuit and use appropriate size wiring.
Ron
I think I'll go this route. I have an in line fuse, 20 amp, that I will add a ring lug too. That wire is thick enough for my use. Only going to draw a couple of amps off of the nut. Do you know the thread size of the stud?