I'm not aware of any standards other than lighter plugs. Honestly it's a bit difficult to find any good marine connectors.
One options is to have a terminal block and ring terminals that you just screw in our out. This is my solution for mast wiring.
Otherwise you're sort of on your own. West marine has trailer connectors which aren't great. Anchor has these and a couple variations:
And there are a huge range of industrial connectors which are generally a pain to find and buy.
1979 Contessa 26