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Oreddie, last month we were able to verify with the Thor factory that the house batteries are not connected to the Sprinter chassis battery at all in our 2014 Thor Citation 24SR with a 2013 Sprinter chassis. Apparently, Mercedes made this change in 2014 for Thor/Sprinter configurations--the Thor rep did not know why this change was made, nor did he know if other Sprinter/RV makers or years were affected.
This information was new to our Camping World sales manager, as well as the Thor rep we met here in Denver (he called the factory to verify the info and was surprised to hear it!). The folks at Camping World were surprised too and actually replaced our totally-drained house batteries. They recommended that we camp with electric hook-ups at least every 3 days or run the generator (which can be done while driving) for 2 hours per day to keep those house batteries charged.
Sounds like your 2015 Citation MAY have the same disconnect between the house and chassis batteries--best to check with the guys at Thor before totally ruining your house batteries like we did.
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