Sorry Daniel not something we are expert in, sounds kind of specialist, and maybe 24 volt or even 240 v requiring ships generator. Only suggestion I have is phoning radar suppliers in NE Scotland say Peterhead, they may have some knowledge. I would expect is going to be sold for spares there won’t be much call for old tech. The website Find a Fishing Boat has a boat electronics section, can’t think of anything else except Bay. Good luck.