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This requires a pretty specific type of switch.
What is the voltage of the cooler motor?
If it's a 120 volt motor, a single pole switch will work. The other characteristics it needs to have are detailed below...
Double throw, center off, maintained contact.
Leviton makes one that is ideal. The part number is ***** The "I" stands for ivory, so if you need a different color, please let me know.
The motor wouldn't be able to have a standard male plug on the end of the cord, and the outlet would have to be a 4 wire outlet, not a 3 wire outlet. You need a 4 wire twist lock outlet, and a matching male plug. I can post recommended parts, if you don't mind standing by.
This is the male end that needs to go on the end of the 4 wire cord going into the motor.
Here's the female outlet that needs to be mounted in a weatherproof box at the unit.
Thank you for posting the link for the cord. I wouldn't be able to find the matching outlet for that cord, unfortunately. This is because it's not a NEMA (National Electrical Manufacturer's Association) configuration. I can only post parts for NEMA products. If you change it so that 4 wires go from the switch to the roof, and connect it properly, it'll work as intended. You'll basically have a neutral, a ground, and two switched hots going to the unit.
The twist lock outlet and the twist lock male end will each have 1 silver screw (for the neutral/white wire), one green screw (for the ground wire), and two gold screws. The gold screws will each represent one of the motor speeds. One should have a red wire connected to it, and the other should have a black wire connected to it, on each twist-lock device.