The easiest way to resolve your problem is to disconnect your neg cable and measure the amp draw between the neg cable and neg post by inserting the leads of your multimeter between the two on the 10 amp scale with the MH not plugged into shore power. If you see more than an amp, say 2 or 3 amps start pulling your 12 v fuses until you see the amp draw bellow 1 amp. You may find that something is left on. If on the other hand you see less than 1 amp I would suspect that you have not fully charged either your house or chassis batteries. Do you have a portable battery charger? Most portables charge at least 10 amps. What type and how many amp converter charger do you have on board your MH? On older MH's they may only charge at 5 amps. Charge until both batteries say full then disconnect the neg cable, if the batteries are good they should hold a charge for several months. Let us know how you make out.