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I recall this being the problem on another 2013 242 LS. That is, the lead connecting the two batteries was not installed during dealer prep which caused intermittent voltage alarms.
Seems like a simple test for our batteries but since there are two batteries how do you know which battery is being tested?
switching your battery from one battery to the other on the battery cutoff switch will give you a reading for each battery.
I had this problem late last season and thought it was just the batteries so I replaced them both with interstate Agms (almost $300 each). Had this problem again yesterday the 4th or 5th day out this year. After listening to the radio at anchor for a few hours yesterday it shut off and wouldn't come back on, soon the aux voltage alarm started going off. I combined the power and got rid of the alarm but need to take care of this for peace of mind going forward. My used boat came with a short negative lead but it wasn't installed, I will install one between the negative terminal on my batteries in the hope of addressing this before the next outing. Funny things are that I hadn't had this issue for the first 4 seasons that I owned the boat and my batteries are on an onboard charger / maintainer whenever the boat is off the water.
