While not a diesel, I have an Itasca Spirit class C motorhome, and with it plugged into shore power full time, the chassis battery will still go dead if the rig is not driven. A Battery Minder solved that entirely. You house batteries are another level of troubleshooting entirely. Good luck!
Roy
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Fulltimer Class of Late 2015, with my bride, Lori.
2015 GMC 3500HD Denali DRW CC LB TrailerSaver TS3
2016 DRV Mobile Suites 38RSB3, MorRyde IS
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