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get your battery tested, 9 out of 10 times it's not the alternator but the battery that causes the light on at high revs.... and if it is the alternator it might just be the regulator that needs replacing, but the age your car is at IMO i would just replace it with a new alternator. It also s the perfect time to upgrade it to a higher amp version

and the reason why i would replace it for a new unit is because if youve never chanced it in your ownership chances are it is the original unit and the bearings will have play by now... so best solution replace the unit... if you don't run power hungry accessories than you can go for a refurbished one that is like for like... but I would skip that and go for a higer output one regardless of the battery size and the accessories i'm running ( TBT i always get the highest amp one since i always run subwoofers and amps)
 
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