You might check to see if the system charges the chassis batteries on shore power. Our 2006 GS Crescendo does not. The way to test is: while plugged in check voltage on chassis batteries and then house batteries. Then unplug from shore power. If the chassis batteries stayed the same voltage, they are not charging.
I added an Amp-L-Start. This device steals a little juice from the house battery circuit and uses that to charge the chassis batteries. I installed mine at the boost solenoid in the rear breaker compartment. Works Great! About $75 and less than an hour.
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