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For me, noise in the morning after rain calls for a good look at your alternator.
Having owned many older cars, I often had noise from the alternator on a damp morning, it is working hard after start-up, this puts stress on the alternator and its bearings.
Once the deficit of charge has been returned to the battery, the regulator may increase and decrease the load at idle.
We HAVE had a dramatic alternator failure - the alternator in our '90 744TI seized up at 215K miles, Luckily, my daughter was near our dealer - they removed the alternator belt and told her to gently drive the 15 miles home - I got a used one from the junk yard.
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