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FERRARI and Mercedes use engine water cooling to cool their alternators while Renault makes use of air cooling.
The formula one alternator can sustain a running temperature of 200-degrees C for the windings and 150-degrees C for the bearings, it is shaft driven normally at engine speed, the amperage output is 35A/H.
Richard is correct, F1 rules says the KERS and the alternator systems must be separate, he was also correct in saying that in 2014 (v6 engine) the engine is to be started by the driver.
The Renault alternator is a Renault build part with internals supplied by various suppliers, the Renault alternator problems is still believed to be overheating by Renault themselves.