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The alternator is designed/made and integrated into/onto the engine design by Renault, they use various suppliers for the internal parts, material/stock, bearings/electrical parts, the electrical parts are supplied by Magnetti Marelli, at Valencia both alternators were completely melted and destroyed which could have been a fire/heat/ or the level of electric power output being made use of.
At Monza the car was stopped just in time before the alternator melted down and it was discovered that it was not an electrical component as supplied by Magnetti Marelli that was the problem, it was a mechanical problem, a bearing “OVERHEATING” so again there is nothing wrong with the supplied bearings.
As I said the alternator is capable of running at a winding temperature of 200 C and a bearing temperature of 150C.
So much for the RBR boss and driver wanting to dump Magnetti Marelli.