[Qbot2640]

Thanks everyone for all the information. I managed to find an inexpensive servo tester on ebay that will ship and arrive quickly. I would have preferred to find something that I could have bought or built from local sources so I could have it immediately - but the closest reliable source for RC stuff is about an hour drive.

While I'm waiting for that to arrive - I'll tackle the 5V power situation. Ideally, I'd like to create something that uses the same 12V robot battery that we will be using to power the motor on the other side of the jag, or some old power supply I have sitting around from an old laptop or something. I think my "enough to be dangerous" electronics can handle getting 5V out of something we have available.

Thanks again!