I here ya. I've used many of those 2, 3, and 4 gang rubberized "trailer connectors" and only use non-conductive Di-electric grease when sticking them together. These connectors are dandy for items removed often, such as stereo components, saddlebag and fairing lights, and aux. driving lights. Tight fitting ones, together with the grease, makes for very little voltage loss across the connector. Easy to check with a meter. However, I wouldn't think of using them on a critical connection like the stator to RR. For this, currently (no pun intended), I'm using three individual bullet connectors, with Kopr-Shield, individually taped. I didn't want a permenant soldered connection, in case I want to test stator output.
Cheers!