One problem related to battery has been reported for the 2003 Mercury Mountaineer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mercury Mountaineer based on all problems reported for the 2003 Mountaineer.
The inside dome lights and the lights on the outside side mirrors do not go off until 15 to 20 min's after it has been alarmed this has run down my battery I had to buy a new battery.