Auto-Trail battery harness

[Diabalo]

On my 2013 Autotrail Mohawk I have 2 leisure batteries that are connected to the PSU via 2 seperate battery harnesses, the batteries are not linked together, should they be or is the necessary done back at the PSU?

 

[iain26]

The batteries are linked in the Sargent panel.

 

[Diabalo]

I thought that must be the case, but started to doubt myself