Really dumb question...

Hi all,

Just like in the title - I'll likely be picking my trailer up later this month, and I want to confirm one thing before I do:

the green wire (ground) attaches to the negative battery terminal, right?

I yanked the battery out and brought it north to keep it charged (which I have not had to do - the thing's keeping a charge marvelously...) -- now, faced with dropping it back in, I want to make sure I don't fry the thing!

Thanks!
John