Mercedes Benz GL450 owners have reported 1 problem related to alternator/generator/regulator (under the electrical system category).
1. Poor battery life and alternator life in 2007 gl 450 2. Engine died and electronics died at highway speeds, reported to Mercedes Benz corporation with no resolve. 3. Lift gate constantly malfunctions and does not close.
See all problems of the 2007 Mercedes Benz GL450.