I am having a similar problem. The problem happens the most when it is raining/after it has finished raining... I am driving and then my battery light and parking brake light come on, and I lose power steering. After a while, I hear a loud squeal and power steering comes back. I have had it happen twice where more lights come on and the car loses power and shuts off. I had the alternator checked, the serpentine belt changed, the pulley changed, the water pump changed. Running out of ideas... The car is an 07 Kia Sedona with 71,000 miles. Any ideas?