Don't give up on us yet. We have several here who have a very good understanding of the 12v system. They'll explain it.
I do know that sometimes (like in my case) they are wired to the converter. These lines are then protected by fuses. Each fuse has a designated amount (i.e., 15 amps) which allows you to hook up a certain number of lines depending on their amp usuage. Like, I think the lights
are about 1.5 amps each.
I think that this is really something a lot of us should have a better understanding of. Glad you asked it.
Another thing that I know is important is the size of the wire that one uses. You don't want to have wire that is too small.
Okay, all you 12v experts......:wave