Mercury Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,The overdrive light flashing means the computer system is seeing a systems fault and when this happens the computer will set and store a fault code and or codes. In order to be able to direct you in the correct repair you are going to need to start first with having the computer system scanned and fault code and or codes retrieved. If you can get this done and post back with the results as well as the year and model of your Mercury we can work from there to determine the cause.