Today I got around to doing something I have wanted to do for a long time:
I wired in an external 12 connector using an Anderson Powerpole connector
set and battery cables. I took the negative from the diesel exhaust
bracket, like the vehicle ground, and took the positive off of the starter
post.

I put another Powerpole connector on a set of jumper cables. If I want to
start my car, start another car, run a 12v shower, I just plug in.

I know others have done this and installed the connectors in various
places, but mine is on the underside of my trailer hitch bar. I taped it up
to keep it clean, surely somebody makes a blank plug for an Anderson
connector. Anderson, say, but I haven't looked yet. That sure is a clever
little gadget.

Now that it's done, I am thinking I need to fuse this sucker. Given what I
want to do with it, what is suggested?

Jim