How to Connect Two 6 Volt Batteries and a 12 Volt Battery Together and Have 12 Volts

Question:

How do you wire 2-6v and 1-12v batteries together all 3 in an RV?

asked by: Mike

Expert Reply:

I attached a picture that shows how to run batteries in both series and in parallel. You will need to wire up the 6V batteries like the picture on the left so that they would be in series and at 12 volts.

To connect a 12 volt battery to that circuit you would need to run the positive post of the 12v battery to the positive side of the battery run on the in series batteries. Not the one that is connecting the two batteries, the one that would be the output of the two in-series batteries. The same goes for the negative side.

expert reply by: Jameson C

click to enlarge

William M.

2/8/2020

How do i change from 2 6volt batteries to 1 12volt battery can you send a diagram i have a 1973 MGB

Jason S.

2/10/2020

To switch from two 6 volt batteries to a single 12 volt you can simply connect all power to the positive terminal and the negative connects directly to the frame ground. The 6 volt batteries you currently have is set up in series. For a visual check out https://www.etrailer.com/question-248463.html.

Gerry V.

3/14/2020

how to connect 2 6 volt batteries to 12 voltfor a Yamaha golf cart

Chris R.

3/16/2020

Wiring two 6V batteries to get 12V power would be the same exact setup as the above diagram for wiring in series. The fact that they are 6V units doesn't change the wiring configuration at all.

Randy S.

5/5/2020

Got 2 6volt batteries hooked up for solar and works great, want to tie in a reg 12 volt battery but not sure how,

Chris R.

5/7/2020

You'll actually just need to follow Jameson's input above on how to wire them all on the same circuit (so they all get charge from the solar panels). Doing this will essentially give you two 12V batteries.

Ben N.

6/15/2020

Is it true that 2- 6v in series and 1-12v will only be charge to the weaker of the two?

Chris R.

6/19/2020

Are you talking about actually charging up a battery bank that's wired like that? The first battery is what will be initially charged but it should eventually start charging the others as well. This isn't the most efficient way to charge them though so it's always best to try and charge each battery up separately when possible.

Leonard G.

11/15/2021

Do you have a diagram of how to hook up 8x6v batteries to make 12v. Thanks

Les D.

11/22/2021

I think you mean, how to hook up eight batteries, rated for six volts each, to make 12 volts all together. There are a few methods. The simplest and cheapest will wear out one or two batteres quicker than the others and cause inballanced charge levels battery to battery. Since I do not have the ability to add a picture here, I wil email it to you.

Leonard G.

11/22/2021

@LesD

Leonard G.

11/22/2021

@LesD Thanks