Hi,
welcome aboard, you poor sick little puppy....LOL
Yes you can test your drivers that way. On page 3 of the KL4030 manual is the wiring diagram. You'll need to follow it.
Common PUL+, DIR+ and ENA+ to your 5V on the C10 BoB. In order to enable the driver short ENA- to 0V. With a short piece of
wire, one end to 0V, each time you brush the PUL- terminal the stepper should rotate one step. Would recommend that you don't have
any microstepping at this stage, the steps are likely to be so small that you'll never detect them.
The C10 is a good board, its like an asshole, everyones got one. If you need another buy a BoB with LEDs on the IO pins, makes it so easy to
set up and diagnose. I use BoBs from Homan Designs in Austrailia but lots of BoBs are made with LEDs. As it stands you'll need a scope or
similar to 'see' any output pulses from the BOB. You should find the pin hooked to ENA- is low, after all your driver inputs are all active low.
You will have to configure Mach AND the C10 to provide active low signals.
Craig