What are the signs that an alternator is going bad & how much is the repair? on 1997 Honda Accord

My Accord recently started making a wiring noise that directly correlates with the RPMs. The battery light also came on and has been increasing in brightness when the RPMs increase. I think it may be the alternator going bad, but I'm not sure. I'm trying to gather information about what sort of repairs the car may need and what it could cost.

Asked by for the 1997 Honda Accord
also, one of the tell tale signs of an alternator going out is to watch your gauges, if they have a tendency to all fall to "0" mph/rpm while the car is being driven, it's caused by the power loss from the alternator not charging properly. I got mine rebuilt 3 months ago for $130.00
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they will either be noisy or your car will start slower than it has been,also ck your lights but this could also be a battery issue. alt is approx 300.00 to 350.00 parts and labor
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