Will your radios work on a 6-volt system or a positive grounding system? RetroSound® radios are designed to work on 12-volt negative grounding systems only. Tagged: 6-VoltPositive Ground Was this article helpful? Yes No Related Articles Amplifier Troubleshooting Radio cuts in and out while car is running. My radio is turning on, but I have no sound. What is a common ground speaker system? Why is my radio not turning on?