Batteries are very important and require proper maintanance. Check output of converter/charger, when plugged into shore power, voltage at battery terminals should read around 13.6 if charger circuit is working. Battery terminals must be kept clean of corrosion and make good contact.Batteries should be of proper type, in good condition, and electrolyte levels kept above the plates.Engine starting battery does not get charged from the converter charger unless your rig has a device installed to do that. The house battery disconnect switch and relay must work so you can park the rig and not have 12 volt appliance controls and alarms slowly drain house batteries. If you need to replace the converter/ charger, recommend the PD 9245 from Progressive Dynamics, it takes good care of your house batteries with modern circuitry. I bought US brand batteries to replace my 10 year old Trojan T-105's, $50 cheaper than T-105's, supposedly as good. If you are going to park your rig for a month, disconnect house batteries and attach a Battery Minder smart trickle charger if you have 110v power available. Attach another one to your engine start battery .
