Y-Cable Help

Hello. I need help with an issue I’ve been having with a Y-cable. My team is looking to implement an intake using a Y cable. I attached some pictures of how it is currently connected (removed some cables to show the Y-cable).

As it currently is, which is like in the pictures, the motors don’t work at all. We tried inverting the orientation and it still didn’t work. Anyone know if I’m doing anything wrong?

Pictures:

Black (ground) to black (ground)! (cables that is)