Thanks for the speedy reply,
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No alternator or battery light came on but a definite burning smell after running for a short while.... This is why I thought it was alternator as happened before in my Landrover and cooked the battery and electrics ( overcharging)
Dies this sound accurate it being the alternator??
Was the burning smell one of burning rubber? If so, this is consistent with a jammed pulley somewhere in the belt drive train. This can be the alternator pulley but it can also be another belt-driven component [e.g. water pump pulley] or idler pulley used to hold the belt in position. If the smell was that of cooked electrical wiring, the fault could be either in the alternator or in the wiring harness between the alternator and battery [there is usually a fusible link in the main feed from the alternator to protect both the alternator and wiring harness if either of these are damaged]. If the diodes in the alternator have failed, current from the battery can fuse the alternator windings resulting in failure.
Has the battery voltage been measured whilst the engine is running and the drive belt running freely? If so, this would usually confirm whether the alternator is at fault. A voltage of 12.5V or less is indicative of alternator failure or faulty wiring , a voltage of 13.5V or higher indicates the alternator and wiring are still functional. This test is not valid if the drive belt is not running freely.
Your mechanic should have undertaken this test when examining your vehicle as well as using their sense of smell to indicate the location of the problem. As always when trying to help from afar, one look into the engine bay is worth a thousand words......