I'd just like to preface this post with the acknowledgement that I know next to nothing about electricity. There's a positive and a negative, that's about the limit of my understanding of it.
As it stands the tether and motor connections are placed through the endcaps into the e-chasis housing and then potted into place with epoxy. Personally I see this as a bit of a limitation to easy repair and modifying of the ROV.
I am looking into making a wet connector (I think other people are doing this as well) and have started to document the process to see if anyone else has any bright ideas.
My idea is best explained through a high quality 3D rendering. But I don't have one of those so a "paint" sketch will have to do.
I began by taking two male bullet connectors, removing the insulation, placing them back to back and soldering them together. But I forgot to take pictures of that, my bad.
Then I put these new custom connectors through a bottle cap and epoxyed them into place.
I attached some female bullet connects onto what would be the "Wet" side and attached a 12v lamp to the wires for testing purposes.
I hooked the whole thing up to some bench power and got some numbers.
3v - 0.82A and 12v - 1.63A readings on the PSU with everything dry.
2.96v and 11.82v on my Multimeter taken across the lamp with everything dry.
I hot glued the cap back on the bottle, cut the bottom of the bottle off and filled it with water.
I also put the probes from a multimeter in the water just for the hell of it.
And I got some more numbers.
11.98v - 1.63A reading on the PSU with both filtered water and salt water.
The readings across the lamp were 11.86v with both filtered and salt water.
0.4v on the multimeter probes with filtered water.
0.2v on the multimeter probes with salt water.
What does this all mean?
I don't really know.