While driving along the speedometer needle drops to zero even though i could be doing 60mph.It lasts ten to twenty seconds before returning to normal and when the needle drops the volume of the radio is reduced also.
It is the vss (vehicle speed sensor). i had the same problem, cost £35 for sensor and clip. its behind the gearbox. very awkward job but can be done yourself. the hardest part is getting the pin out, you need a very good pair of molegrips and a lot of patience.
The alternator is sending a spike of power to the system. replace the altenator and you should be fine
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