All You need is 2 Wires to do that,,, But would probably be a good idea to include

an Isolater as well so as not to deplete the Start Battery while using the House Batt’ in

camping config ~

> On 18 Jun , 2024, at 8:47 AM, Jack R <jack007@COMCAST.NET> wrote:
> 
> Has anyone installed a DC to DC battery charger for the AUX battery?
> 
> This allows you to charge off the starter battery/alternator to the AUX (any
> battery type).
> 
> Seems like the way to go.
> 
> https://tinyurl.com/4pwmmyyh
> 
> 
> 
> Jack R.