The Universal Cable from Mekanism doesn't appear to visually connect to the Steam Turbine, though power still flows through it.

I originally raised the issue on the Mekanism github and, was redirected here. It's only a visual bug so, I'm not overwhelmingly concerned, just figured I'd toss it out there.

Here's the closed post mentioning the Buildcraft API: mekanism/Mekanism#714 (comment)

I'm going to close this too since it doesn't involve the BC API at all. See comment on original issue.