TL;DR: I think it's the controller.
Checked the wire with the multimeter and I'm getting no voltage. Checked it downstream closer to the controller to rule out a bad wire, still no voltage.
Asking rad if they have a controller for sale.
Thinking about popping the controller open and looking for the bad part. Anyone have any luck doing this? Hoping it is like a tv and I'll see an obvious bad capacitor or something.