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Alternator ;ight?

Hi I have a 53 plate Vauxhall vivario and ive just had a new turbo fitted on this. \since doing this my alternator light comes on at 2500-3000rpm checked alternator and its charging why does light come on anyone know why thank you
tony wilson, January 2015
Have you checked that it's not overcharging?
what's the voltage reading at 2000-3000?
anything above say 14.5 v will make the light come on.

1/4drive, January 2015
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