I'm Confused?

I like to put some elec tape near the connectors on my batt cables. Black tape on my neg cables and some red on pos ones. I see the tape and know I've already checked where the wires are supposed to go. I do this no matter what color cable it being used.

BFL13 wrote:
NOOOOO---the white wires on the RV go to the neg post and the black ones go to the pos post!!!!! (on many Rvs they use red instead of black for pos but white is always neg)

Ok, thank you for that info. It saves me from making some sparks. I'll try that.

NOOOOO---the white wires on the RV go to the neg post and the black ones go to the pos post!!!!! (on many Rvs they use red instead of black for pos but white is always neg)

We'll after reading all your replies, I think I did a stupid when I removed the batteries. The one wire I said that was running from pos to pos may have been running from pos to neg. I just looked at the one battery and assumed they were both installed the same direction when they were sitting side by side. I didn't pay attention to see if maybe the other battery sitting beside it was turned around. Duh. If so, then the one wire running from pos on one battery would be to the neg on the other battery. Because I was in a hurry, I did't look at both batteries the way I should have.
When I go out tomorrow, I'll run a cable on neg to neg and pos to pos. I'll connect those two white wires from the rv to the pos and the two black wires from the rv to the neg. hopefully that'll do it. I'll let you know. Thanks for helping me get my thought process to going.

Your 6V batteries could not possibly have been wired as you described or they would NEVER have worked. Period.

This is diagram from google search on how the 6VDC and 12VDC are wired up.



Roy Ken

MSGTRETIREDCSP wrote:
I just removed two 6v batteries from my fifth wheel rv. I'm going to replace them with two 12v batteries. When I removed the 6v batteries, there was one wire running from pos to pos on the two batteries. There were two large white wires from the rv and going to the neg post of one battery. There was also two large black wires going from the rv to the neg battery post of the other 6v battery. With the one wire that was running from pos to pos of both batteries, that tells me that they were both wired in parallel? Am I right? What confuses me is if they are both 6v batteries, wouldn't they need to be wired in series to get 12v in an RV that is 12v?
My fear is installing the two new 12v batteries. I don't want to wire the same only to find out it's wired in series. I don't want to screw things up with 24v.
Can you help me out? Thanks

Two 6 volt batts need to be wired pos on one batt to neg on the other batt to make up a 12v batt.

Then the load pos and neg goes on the other batt posts not being used.

Reading your description it is impossible. The two black (pos) wires should have gone to the pos post of one of the 6s not the neg post. The two white wires should have gone to the neg post of the other battery, which they did.

I can't figure out how you ever got anything as it was. Perhaps you didn't need to swap 6v for two 12s, but just got the wiring right on the 6s.

installing 12v batteries +to+ -to- will give you 12 volts.