...or fan motor windings down to earth (ground in US talk), ballast resistor failed, water or contaminants in connector blocks and faulty wiring can be the caus(es).
Time to get the multimeter out......
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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