One problem related to alternator/generator/regulator has been reported for the 2005 Mini Cooper S. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Mini Cooper S based on all problems reported for the 2005 Cooper S.
Battery light flashing, power steering cutting out intermittently while driving. Alternator and serpintine belt replaced but problem continues. Electric power steering seems to be draining electrical system.