Mateschitz asks Renault to separate from its alternator supplier

Sebastian Vettel retired from the 2012 Italian Grand Prix due to alternator failureThe reigning champions have been dogged by a recurring reliability problem in 2012, which cost Sebastian Vettel victory at Valencia and crucial points at Monza. The faulty component, which has also failed in other Renault-powered cars this year including the Lotus of Romain Grosjean (at Valencia) and the Pirelli