Mercury Repair Questions? Ask a Mechanic for Answers ASAP
did you verify the battery has 12 volts? do you have a test light to check for power to the starter? does the starter make any noises when you turn the ignition key? does the security light flash no stop or stop flashing?
If there is battery power to both terminals at the starter the start may have failed. Many times you can take a hammer and rap the starter/shock it and it will work a few more times. Even if the starter works after shocking it I still would recommend replacing it.
Let me know what you find
let me know what engine you have and I can tell you where the starter is located.