I don't have the predator but I have the Trinity. It will power up from the computer when you connect it. Draws a charge from the computer. Maybe yours does too?
2015 Ram 2500 6.4L Hemi, 4:10 gear ratio, 5" Rough Country Lift, 20" MotoMetal 962 Wheels with 0 offset, Nitto Trail Grappler 37 X 12.50 Tires, Bakflip G2 Box Cover, LineX Spray-on Bedliner, Amp Research Power step