House Battery issue

[flaflier]

Came home from a 2 month trip, knowing i had an issue with at least one of my house batteries so decided to change all 4,6 volt batteries in my 2008 Excursion DP.
Changed the batteries and carefully re wired all terminals as they were from the old batteries.
With my meter I checked from the chassis ground to the 300 amp fuse going to the coach and got 12.9volts....... should be good to go.
Went inside and checked the inside gauge voltage in the coach and it only reads 6.3 volts ! Know I am missing something. Any Ideas ?
Starting Batteries still read 12.7 volts on the inside gauge

[danielmcross]

Has that inside gauge read correctly in the past?

[vsheetz]

Do you before pictures of the cabling match to what you have now?

[flaflier]

yes and yes to the last 2 questions.