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Ive found the alternator belt needs to be fairly tight to not squeal. Additional electrical load will increase the tendency to squeal. Try tightening it and see if the squeal goes away. If it doesn't, pull the cam belt covers immediately! It could also be the power steering if so equiped, but that should be easy to single out, as it should be easy to induce squealing when steering in a parking lot, etc.
New belts always stretch a lot, so if the alternator belt is fairly new and hasn't been retensioned since initial installation, I bet you it's that. It doesn't have a spring tensioner like newer cars.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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