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Here is how to rule out the belt. Get some litium grease called "belt dressing" spray. Spray it on the belt with the engine running and if the noise stops, the issue is the belt. If not, then start checking the idler and tensioner pulley. You cn spray lithium right into the pulley bearing area or graphite door lube grease. WD 40 works too. If the noise goes away on them, then you know which it is. If it remains, then check the alternator next. It is the next common to cause the noise.
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