Finished up the winch install well after dark:30. Working night shift and living like a vampire really sucks sometimes (no pun intended).
AGAIN, the top batt box bolt just spun despite not tightening very tight last time. It was no match for my Cornwell 3/8 impact though. I drilled 2 holes just to either side of it this time...the ideal being that you can stick the screwdriver or allen in the tool kit through and wedge the anchor and get the bolt out.
My batt cover has never fit very well where the wires go into it, so i trimmed it back with the addition of the extra winch wires.
Removed the lead to the battery for a trickle charger from the previous owner (only so many threads on those battery bolts). Instead, i installed it to the +/- leads out at the contactor. Under the hood and nice and easy to get too.