Problem charging House Batteries

I thought the battery solenoid that may be the problem. I called a RV repair shop and they said it maybe the problem and to check to see if there is voltage from the ignition on the center post of the solenoid. I ran the test. Engine off the voltage to house was 12.7v, voltage from engine battery was 12.6v and from ignition was zero as it should be. I started the engine and did a recheck. The house battery post was 14.1v, the engine battery post was 14.0v and the center ignition was 14.1v. So the battery solenoid is not the problem. But perhaps, I should remove the battery solenoid and clean up all the contacts. Then look at the converter charger and test that. However, everything seems to be up to the right voltage and amp levels.