Trickle charger for 24v Stern thruster

Normally the 24 volt charger is wired directly to the thruster battery. It is powered by the service batteries. Even with the thruster battery switch off. Did you disconnect the batteries at the battery terminals or with the switch?

Hi Leon

In addition to Leon's fuse checking, I would also recommend checking that you have power leaving the Magic Charger.  It is near the big board, if you're not familiar.  There will be one for the bow thruster and one for the stern.  In my installation, the stern charger was actually the forward one.  Unless you are a dentist and good with mirrors or have the shoulders of 5 year old boy, you'll have to remove it from the mount to find out where to stick the probes.  My bow thruster charger did actually fail on me over the winter where there was a small, draining (not the thruster) load.  The charger is the cheap part (~US$320) ... the batteries ... not quite.

At present, not much.  The original owner did quite an overhaul of the boat's systems and the interior sometime around 2018 or 2019.  Among the many things, they installed a Mastervolt management system.  With a little software and a USB cable, I can look at each Mastervolt Li battery for its charge cycles, lowest historical charge, etc.  It also reports on the status of smart equipment (chargers and inverters), but only to the Mastervolt panel on the boat.  It doesn't report to the other systems or to me when I'm not on the boat.  The system is also equipped with a generator autostart relay.  When the house batteries drop below a certain level, it can start the generator automatically to top them off.  Since I don't live on the boat and am not quite comfortable letting the machines take over everything, I have disabled this ... but it might be nice for others.  By itself, I don't know that it is worthwhile, but maybe I'm not trying to get much out of it.

i have installed the czone myself, when i added the mastervolt Lithium batteries and the MPPT for the solar panels. So, i've also installed the management system, because it was the only way to bridge the two and, most importantly, to program the MPPTs and the batteries to work correctly together. It was quite difficult to get assistance and guidance from Mastervolt because, obviously, they like their technicians to do it. But I finally succeeded with some trial and error on the communication protocols...Very stable now since 3 years of use. I am very happy with the solution and the lithium batteries are simply fantastic. Differently from Jon, i don't remotely control/monitor the boat...