Trouble hooking up battery.

tommymsw wrote:
First let me start by saying I have done my work and know how to hook up house batteries.
Second, let me say that I just have an old tiny RV. It is not much, but it is mine.

So I just bought it this winter and have been fixing it up. Now it is summer and I want to put a new house battery in. But I have no idea what wires go where.

I am not overly worried as I may blow a fuse or two figuring it out, but just wanted some experienced advice...

I am guessing that the 2 white and the red wire would connect to the POSITIVE terminal and the black wires that attach to the side and come down go to the NEGATIVE.

But there is ONE more black wire (lowest wire in the picture) that is not connected to the others. I am assuming it is STILL a negative, and that all 3 black wires are negative and the red and 2 white are positive. That would mean 3 negative and 3 positive.. so my math works out. :)

Maybe the red wire and the FREE black wire are the charging wires?

Does anybody think I am wrong?

ASSUME nothing.
You must trace each wire back to the source and then attach labels.
Then you will have facts.
You need to KNOW.

Can you follow any wires back to a Charge Controller?
What about frame ground?

I would be very worried about "blowing a fuse or two".
Reverse polarity may damage the device on the other end before the fuse blows - not a good idea.