Cadet57 0 Report post Posted January 9, 2013 There are Four Batteries on a 400SY (and I'm sure the same on other Cruisers) I need to learn/discover/know which Two are the "House Bank" I wish to replace just those.. Appreciate any assistance... Share this post Link to post Share on other sites
CaptBob 0 Report post Posted March 14, 2013 Are any of the batteries you have labeled "Starter"? ( I know it sounds like a dumb question, but I was able to help someone out with that same answer as well)if two are, and two are not....then those are your house batteries. Also look at the cranking amps off all four, and see if they differ. Share this post Link to post Share on other sites