I recently picked up a Schauer 15 amp "Smart charger" at Walmart to allow me to fully charge and equalize my batteries. (The factory charger tops out at about 14.3 volts, which leaves the batteries less than 100%.)
I'm glad I disconnected the batteries and monitored with a good voltmeter. 16.3 volts is enough to hurt the batteries and possibly fry some electronics.
Just sayin', never trust new equipment.
I installed this voltmeter on the dash and have it plugged in to the power outlet. It allows me to constantly monitor the house batteries. Sixteen bucks at Wally World.
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012