11-10-2013, 10:05 PM
When you are on shore power, ONLY the house batteries are being charged UNLESS you have the merge switch on. When the alternator is providing a charge, it SHOULD activate the merge solenoid so that both battery banks are being charged by the alternator. Newell recommends replacing the merge solenoid every year. I don't do that but I have replaced at about 3 year intervals.