An electrical test system for providing a power source to each of a plurality of electrical components under electrical test includes a grouped circuitry module. The grouped circuitry module includes a plurality of individually-programmable power sources, each coupled to an output channel, a controller configured to program each of the power sources to a respective stimulus output value and to read a measured value at each corresponding output channel and random access, non-volatile, memory for storing information and for providing read/write capability for the controller. A host computer is in communication with the controller for running a self test program that sequentially programs each of the power sources to its respective stimulus output value and reads the measured value at each corresponding output channel using the controller to determine if the tested complete subsystem is operating properly.