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When I start my car up with the key ON the odometer will display properly. When I crack it over and start the car up it blacks out 75% of the time and stays off for 10 - 30 minutes until it comes back on and then may go out again. I know the miles are being recorded properly because if the screen is black and i can reset my trip and when the display finally comes back on it will show 3.4 miles or what ever.