The redarc dcdc unit. ($180 +,-) are good.
Basically you tap into your positive battery terminal to one side of the terminal of their solenoid unit.
Then another cable off the outlet terminal to your battery position.
Using a fuse before and after the the solenoid is a must.
Using twin core double insulated is best I believe.
Connecting the negative to the battery directly rather than chassis.
Anderson plugs are fine at the battery end.
But I advise to mount two or 3 Anderson plugs, splitting the feed.
Then fit a lead with one or two Anderson plug off your battery ,
Plug it into one of feed Anderson plugs. This will leave you one spare plug that you can either draw from, or connect your solar panel up too for charging.
These solenoids have a built in diode that only let's power go from your cranking/ primary battery to the auxiliary.
And not back feed from auxiliary to cranking .
Even if your auxiliary battery goes dead flat accidentally.
It won't affect your cranking battery.
I fed mine through the fire wall near the brake booster, then along the sill into the back of my XJ.
Always fit another fuse to each individual Anderson plug feed from your auxiliary battery terminal between the battery and Anderson plug.
Middy blade fuse unit its are about $20 +,- with the fuse included on line.
30amp fuses should fine
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