Red Bull call on Renault to fix alternator problem threatening Vettel's title bid

Team to run new specification this weekend in Brazil

Last Updated: 22/11/12 12:18pm

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Red Bull boss Christian Horner has expressed his concern about the reliability fears which threaten to cost Sebastian Vettel a third successive Drivers' Championship.

Twice this season - first at Valencia in June when he was leading the European GP and then more recently at September's Italian GP - Vettel has been forced to retire from a race due to an alternator failure. It's a problem that reoccurred last weekend when Mark Webber's RB8 ground to a halt from third place during Sunday's U.S. GP.

"For sure, the alternator is a concern," Horner told The Guardian.

"It is the third failure we have had this year. It is something [engine supplier] Renault need to get on top of this week. They have run different solutions on different cars and hopefully they have enough data now to make sure we have a reliable version. It is not ideal at the moment."

Sky Sports F1 understands that the alternator which failed Webber was an older specification than the one which broke on Vettel's car in Valencia and Monza. It's believed that the team will be using the newer version on both cars this weekend.

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