Join Date: Feb 2007
Location: Spain + Germany
My Motorhome: Four Winds RV
Thanked 766 Times in 710 Posts
If you are seeing 13.7, and the reading is correct, you are charging the batteries at the moment. It is normal for the capacity to be below 100% while the batteries are charging. Once they reach 100% the charging will taper off.
When your batteries are not on charge, or a while after they come off charge, say an hour later when the voltage has settled, you shoud see only 12.6 or 12.7 volts. Anything more than that and either your gauge is wrong or the batteries are getting a charge from somewhere.
Do you have a solar panel?
There is a battery charge graphic which I will try and find to post for you.
Brexiters. It's your sh1t now. Whatever happens nationally and internationally you own it. I wish you luck. I think you're going to need all you can get and then some. Friday 13th December 2019.