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The failed Renault alternator is a Renault part it is not linked with the Italian supplier Magneti Marelli.
Overheating is the problem, we use various suppliers for the sub internals but we build the alternator so we are responsible for the integrity of the part (Rob White).
The alternator is shaft driven off the crankshaft sitting in between the water pump and the hydraulic pump, it weighs 750g, is 5cm in diameter by 7cm long, maximum running temperatures are 200 degrees C for the copper windings and 150 degrees C for the bearings.
Two of the four engine manufacturers use water cooling to cool the alternator, Renault uses air cooling.