Mercury Mariner owners have reported 1 problem related to alternator/generator/regulator (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Mariner based on all problems reported for the Mariner.
First started with a suddenly a dead battery. Replaced the battery and 3 months later happened again. Slowly dead battery every 1-3 months. Replaced 4 batteries. Was diagnosed with a bad alternator. Alternator replaced. Three days later dead battery. Another alternator installed and again, two days later dead battery. Ford refused to help even after giving me a case number. Said because I've never had vehicle serviced at a dealership they couldn't do anything because they support their dealers. Also, Ford customer service failed to tell me the pcm was still under warranty. Took the car to Ford dealership in dover, DE. Diagnosed with a bad pcm. Pcm installed by dealership and told that should fix the problem. Drove the vehicle home and tried restarting. Battery dead again. Battery replaced per recommendations by dealership. Drove the next day, but by the end of the day battery dead again. Had to buy a remote battery pack to start the car when the battery is dead. Have been stranded 10 times and had to jump start to get home. Ford dealership told me to replace the alternator with a genuine Ford alternator ant that should fix the problem. Purchased the alternator and had it installed. Highest voltage, even with accessories turned on, was 12. 8 volts and wouldn't go any higher. I am returning back to Ford dealership on Tuesday, 10/28/14 to see if they will contact Ford engineers for solution. So far, 6 batteries, 2 alternators, new pcm and battery is still not being charged. Running out of patience and money.
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