Took your advice and changed the Motor Outputs to “A” and the input signals to A also.
See screen shots below.
Moved the jumper from Z on the BOB to the A position and the other end to the Z driver.
X and Y are working normally. Z will not move + or -.
Checked the Dir voltage and both + and - were 0.
Connected the jumper from A on the BOB to the Y driver.
The Y stepper will move + and -.
Could not measure voltage cables in way.
Connected the jumper from the Y on the BOB to the Z driver.
The Z stepper will not move.
Looks like the Z driver card is not operating.
Replaced jumpers back to Y-Y and A-Z
Took the Y cable connection to stepper and put it on Z stepper. Z stepper will go + and – when going through the Y drive card.
Nothing is wrong with the Z stepper.
Could it still be Mach3?
I'll send PM with phone no.