Wiring two batteries together

This is what is balanced and best for twin twelve volt batteries.



As it often doesn't cost a dime more to do this, I think it is worth the trouble.

If you wish to understand the "why" surf here:

correctly interconnecting multiple twelve volt batteries

Others may say it doesn't matter--but unless there is a compelling reason to not optimize charging and discharging why not do it the best possible way?

Yep, get your 2 year old tested. If it is good (and should be) look for a short (drain) on your TT.

If your present battery is bad then just buy one new one and have another go at it. You can always get the 2nd one within a month or so of the first if you find you need it.

sprinter31 wrote:
Hey all, just joined this site..
I am having problems keeping battery life in my travel trailer for more than one day.

Agree with previous post. A fully charged, deep cycle battery will give you days of power - UNLESS, something is drawing on the battery constantly at a high amperage or a component is faulty resulting in a high amperage draw ( a binding water pump shaft, for instance).


Teach

First things first. You need to take the battery out, recharge it fully and have it load tested. I suspect your current battery is toast due to ? Second you should never connect batteries of differeng ages together. The weak battery will discharge the good one. So be prepared to buy two batteries. NOT those over priced die hard dual function things either. Do some research for true deep cycle batteries. They may cost a bit more but with peoper care will last much longer. As for connecting? + to+ and - to - for the two 12 volt batteries. Connect the + from the trailer to + on one battery ans - from trailer to - of the other battery. You then have one giant 12 volt battery.

facory wrote:
Connect + to + and - to -. Connect the negative from the trailer to the negative on one battery and the positive from the trailer to the positive on the other battery to get even distribution of voltage.

Correct...and good advice.
Also probably best to start with 2 new fresh batteries. The system will only be as good as the weakest (old battery). The old batt. may draw down the new one that you add.

Connect + to + and - to -. Connect the negative from the trailer to the negative on one battery and the positive from the trailer to the positive on the other battery to get even distribution of voltage.