I know what my thoughts are, but looking for more input etc.
I had issues last year with a lot of strange electrical gremlins that stopped when I charged my battery with mains charger.
It took considerably longer than the normal 12hrs or there abouts for a depleted battery as I understand it.
I've since charged it a few months ago and done again this weekend taking and it's taken best part of 24hrs.
I have a new rectifier with 14.5v set point and a reading at the terminal of 14.2-14.3v which should be good enough to keep it charged.
Give us ya thoughts guys.