Forum Discussion

prelucir's avatar
prelucir
Explorer
May 27, 2018

Dual Battery in my 5th wheel.

I have two battery compartments in my 5th wheel. However, only one has the batter connections coming from it. An I simply add the second batter and connect to the same posts that my other batter are connected to? I can by the cables from Napa in any length that I want.

I am just concerned that by adding a second batter that I will end up with 24 volts vs. 12 volts.


I have a 2017 Heartland Bighorn 3575EL.


Thanks for the help.

-John
  • donn0128's avatar
    donn0128
    Explorer II
    May 27, 2018
    Yes. As long as you connect plus to plus and minus to minus all is good. Depending on how long your connecting cables need to be you can buy welding cable which is very flexible and have ends put on them. They will carry way more current than you will ever need, but sometimes ease of handling is worth it.
  • prelucir's avatar
    prelucir
    Explorer
    May 27, 2018
    So just a further thought, how would they have to be connected to have 24 volts? I don't want 24 volts, I just want to ensure I don't do it incorrectly.

    Again, thanks a lot.

    -John
  • prelucir's avatar
    prelucir
    Explorer
    May 27, 2018
    Just be sure I am clear, as I not very bright when it comes to DC.

    I can take the red wire from the second battery and attach it to the same place the red wire from the first battery is attached to the 5th wheel?

    And the black also, correct?

    Thank you,

    -John
  • MNRon's avatar
    MNRon
    Explorer
    May 27, 2018
    Hook two 12v batteries in parallel (doubles capacity but not voltage) by hooking positive to positive and negative to negative (reds together, and blacks together).

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