Hi folks, this may be a dumb question but I figured I’d ask before I just started disconnecting things.

After some behind battery tray rust repair, I need to replace the main electrical grommet back there (P/N 123 997 32 81).

It looks like the right lights, as well as some AC, and some ground wires go through here.
I assume I should disconnect everything from the engine side in order to get the new grommet in? Any tips for this?

Thanks!