The post may be easier, but there have been cases where the post has spun when the nut is locked back down. If this occurs, the fix is to replace the entire main harness assembly!
Eh?? You do not need to replace the entire harness just because you spin the post - its just a stud that is bolted to that box (power distrubution center, or PDC), and all you have to do is get to the bolt from underneath - I had to do this just a few days ago. Its not even that difficult.
To fix:
- remove the plate on the side of the PDC so you can get to the closest bolt holding the PDC down. Its just a couple of hex-head screws and two sheet metal screws on the bottom.
- remove the C-100 connector going through the firewall to the right so you can turn the PDC enough to get to the bolt holding the battery cable stud. The C-100 connector is held with a single hex-head screw, just unscrew it and pull the connector out.
- remove the three hex-head screws holding the PDC down.
- rotate the PDC so you can access the underside. Its slightly difficult to do with the battery cable still attached, but not impossible.
- unsnap and remove the bottom cover: unsnap the left end, then take a screwdrive and carefully unsnap the two snaps in the middle of the cover
- use a 15mm socket (yes, the PDC is metric, for some reason) and thread it through the wires inside the PDC to the nut holding the battery post threaded stud to the PDC. You may have to hold the top nut in place so it doesn't rotate.
At this point you might want to go ahead and *remove* the underside nut, then pull the stud with the battery cable attached out, so you can get that @#%$% battery cable nut on top loose without destroying the PDC. As you are still attached to the battery, you might want to lay some towels down on the footbox so you won't be sparking everywhere. Once you get the battery cable nut off, you can then put some anti-seize or something to hopefully prevent it from corroding on again, then put it back on, and use that nut on top to carefully tighten the underside nut back on.