2005 H38 house batteries not charging while motoring?

Jun 5, 2012
51
Hunter 38 Chicago, IL
on the water right now and motoring home. went below and noticed that the house batteries are below 12 volts looking at the panel. perhaps they aren't charging? I recall seeing the voltage bounce up as charged. thoughts?
 

BobH57

.
Oct 23, 2019
91
Hunter 410 Solomons, MD
Had the same sort of problem while in the Bahamas winter before last- engine alternator was charging starting battery but not the house banks. At first I thought it must be related to the battery isolator, but it turned out to be a bad solenoid
 
Jun 5, 2012
51
Hunter 38 Chicago, IL
both parallel charge starter circuits needed to be reset. now its charging. interesting.