The hopper motor runs on 120VAC.
There is no hopper relay, it is turned on via a Triac on the hopper control board.
It is advised to unplug the hopper control board and apply 120VAC directly to the hopper motor contacts.
A simple, and dangerous way to get 120 VAC for the hopper motor, is to get a 2 wire extension cord and cut off the female end.
This is called a suicide cord.
Get a distribution module with multiple AC outlets and make sure it is turned off but plugged into the wall.
Use some alligator jumpers to connect the hopper motor terminals to the ends of the cut extension cord.
Turn on the power distribution unit to apply 120 VAC tot he hopper motor, turn it off and unplug it when the test is done.