Thursday, June 1, 2023


RV battery wiring explained


gary-736Hi Gary,
I have an older Nash 5th wheeler. I have one completely dead battery in it now. I want to replace it with two (Group 24) 12-volt batteries. I’m not sure how to hook them up. There is not enough room for two small 6-volt batteries, as the space is quite small. Can you help me? —Stan S.

Hi Stan,
Parallel 12-volt batteries are interconnected by routing a battery cable from the positive post of one battery to the other positive post on the other battery. Same for the negative cable: negative to negative. The positive side of the load is then connected to the positive post of one battery and the negative side of the load is connected to the negative post on the other battery. That’s the best scenario for a two-battery bank.

But if you have room for two 12-volt batteries, you will have room for two 6-volt batteries wired in series. Typically, two 6-volt batteries wired in series will yield a little more storage capacity than two 12-volt batteries wired in parallel, assuming the batteries have the same footprint. But it’s certainly your choice!

Read more from Gary Bunzer at the See Gary’s videos about RV repair and maintenance.




0 0 votes
Article Rating
Subscribe to comments
Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

1 Comment
Inline Feedbacks
View all comments
F. Gisler
5 years ago

Hi Gary,
I’m wondering if you can recommend a programmable thermostat for the heater in our 2016 Forest River Surveyor travel trailer. It would be wonderful to set it so the heater comes on by itself on those cold mornings in the campground! Thanks!

Sign up for the

RVtravel Newsletter

Sign up and receive 3 FREE RV Checklists: Set-Up, Take-Down and Packing List.