Electrical charging of common spacecraft materials flown on a high-altitude satellite are measured by the Satellite Surface Potential Monitor experiment and the data obtained are used as a framework for future modeling of spacecraft charging. Results from two magnetically disturbed times were chosen; one when the USAF P78-2 satellite was in eclipse on March 28, 1979 and the other which occurred in sunlight on April 24, 1979. On both days, the spacecraft charged negatively in the Earth's shadow to greater than -5 kV. From the results of these data, the location of various insulating materials, as well as their physical properties, must be considered if the details of spacecraft charging are to be understood.