Here's how to check the reference voltage of the board stepper driver.
Driver is a Polulu with the Alegro Chip A4988 set for 1/16 microstepping
The motor is a 42HD4027-04 with 1.5A/Phase
Can't do the math at this time of night but my printer is reading 1.07 that sound about right to me
UPDATE: for the alegro integrated drives the math goes like this: 1.5A x 0.8 => 1.2v ref, so anything from 1.0 to 1.2 should be ok
https://reprap.org/wiki/Pololu_stepper_driver_board
https://www.pololu.com/product/1182
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