Depending upon the year and make of your Ranger, you may have extra circuits on the fuse block that you can link another bilge pump into. That's what I did on mine years ago to have 2, 1 auto, 1 manual. Plus a spare on a long hose with a long wire, switch and alligator clips that could be done with a cigarette light plug too if preferred.
I also have have a large jug manual scoop and a tall hand pump for backups.
You'll need your owners manual with wiring schematic for the circuit block to figure out what might be open and which wires to use. Many Rangers have extra switches even that can be used for the right circuit to run another electric device or two.
Or, you can just use new wires to battery clips right to the battery best available for this extra draw. Just splice in the proper sized fuse into the positive wire, and run the wire to a new switch in your dash/cockpit area, or splice in a switch in the bilge area. Just try to use a little better quality switch that might be waterproof if possible since that will be the most likely failure point besides blown fuses. And carry plenty of extra fuses for all sizes in your boat.