[Al Skierkiewicz]

Jon,
The 12 volt radio output is a boost regulator designed to keep the radio up under brownouts on the battery. According to the schematic there is a fuse on the input of the supply and a solid state fuse on the output of the supply. I would try keeping the radio disconnected for several minutes, turn the robot on and checking the voltage again. You might have a shorted radio cable and the several minutes allow the solid state device to reset. These are surface mount devices. If that doesn't clear the problem, I would contact Frist and see if you can get another one or get yours repaired.