Ordered replacement alternator, belts, and tensioners in an effort to quiet the golf cart sound which has gotten worse. Still not sure if main sound is from alternator or the power steering pump. I did replace the PS reservoir and cleaned fluid which made zero change. As the noise is purely dependent on rpm and does not change when turning the steering the alternator (original air cooled unit 2005 104k miles) is up next.

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2003 E39 530i
1992 MX5
2005 E53 x5 4.8is (sold)
1990 K75S (sold)