Hello:I have two 6v batteries in my 5er that were installed a couple years ago. Yesterday while cleaning up the rig, I noticed that the batteries were connected in a strange way. the positive from on battery is connected to the negative of the second batteries and the neg of the 1st is connected to the pos of the 2nd. Does this seem right? I haven't had any electrical problems but it just seemed strange.any comments?

They are wired correctly. RV systems, lights, furnace, water heater, fridge etc. run on 12 volts. Your two 6 volt batteries are wired in series, meaning the voltage is added together. 6 Volts + 6 volts = 12 volts.

Do you mean they have criss-crossed links?

There should be only ONE interconnect between the batteries (positive of one to negative of the other).And the wires from batteries to the RV--The positive should come off one battery positiveThe negative should come off the other battery negative.Neither wire to house from either battery's interconnection.

BFL13 wrote:Do you mean they have criss-crossed links?That is how I read it, doesn't make sense.

DUAL BATTERY CONNECTION | Good Sam Community

BTPO1
Explorer
Feb 21, 2020
time2roll wrote:
I doubt they are wired as you describe. Please post a picture.
Basically if it is working... then it is wired correct.

Be very careful or get assistance if you replace those batteries to get the new ones wired right.

I agree, as I read it, it should be melted. Many years ago after a graveyard shift I decided to hook my second battery up in my boat. I was very tired and I should have got some sleep first. As soon as turned my selector switch to both batteries it blew 100A fuse and melted the post off the battery. Basically I did what I am reading here. 2 volt batteries cross wired. It would be nice to see some pictures. JMO
wa8yxm
Explorer III
Feb 21, 2020
I missed the second interconnect

You connect negative #` to ground Positive to Negative #2 positive #2 to house power.

I think you mis-read the positive 2 lead's other end.

I run a mix of 4 different batteries here
one 6Vpair
one each group 27-29-r31 Alas the store was otu of 31s
Dtank
Explorer
Feb 22, 2020
bob213 wrote:
Should only be one connection between batteries. Good info here:
12 volt side of life

"Maybe" the OP didn't relate his "set-up" clearly or correctly!

"Maybe" the replies didn't take that into consideration -or- maybe they didn't relate the solution clearly or correctly.

The link (with diagrams & info) does both !!

Can't beat that with a pogo stick as a "jumper"..:W

~
2oldman
Explorer II
Feb 24, 2020
He's gone, and no, they aren't connected that way.
RJsfishin
Explorer
Feb 25, 2020
tells once again people don't even bother to read a post before they make a stupid comment on it !
That or else a lot of stupid people that don't know how to wire a simple series parallel

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