I was in the 95 diesel today on the highway (95 north in RI) cruising like only she can about 80 mph and I start hearing a loud whirring noise. So I Start shutting things off like the radio, blower and wipers and the noise is still there. I get to my destination and stop the car and pop the hood. Nothing readily apparent but when I turned my lights back on the loud whirring started again even with the car off.

I usually drive with the fogs on as my daytime driving lights so now I know what drives the noise. It seems to come from the front right side of the engine compartment. Can it be alternator related?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles