Mercury Repair Questions? Ask a Mechanic for Answers ASAP
The alarm goes off because it sees unauthorized entry. The doors are locked and the computer senses a power drain like a light coming on. It thinks someone has broken the door glass and reached in to open the door or hood. Most often its a sticking hood or door ajar switch. Open all the doors and spray 5 seconds of lube into the door latches to see if that helps and check the hood switch adjustment.
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I prefer liquid wrench spray. The switch is near the drivers headlight