Greetings fellow techs. I am currently a student finishing up my senior year in Electrical Engineering. At work, I work with motion controls. Currently I have a project that I am working on, where our engineer designed a board to interface with a controller/driver. The circuit basically consists of a couple resistor, voltage regulator, diode and relay. When testing interface board alone, all voltages measure correct. However, when connected to the controller/driver, the voltage drops to 1.8 Vdc, instead of the 24Vdc input that it should be. Could this be an isolation problem? any input would be appreciated.