Good afternoon folks! First time posting on the site, but I've always been on the site getting info & DIYs for my 2001 IS300 Auto. My car went into limp mode this past Thursday and when I checked the alternator and battery, the alternator was completely shot, so I replaced the alt and battery over the weekend. Did everything just like the DIY. Wasn't hard at all to remove and replace. As i began to drive the car, I noticed that the voltage kept dropping and the car seems to stall a little bit, but the stalling doesnt happen too often. Furthermore, there seems to be a whining noise coming from my power steering pulley (it wiggles laterally slightly at idle, but straightens out when I step on the gas). The voltage drops whenever it wants if you will. Sometimes it drops and sometimes its perfect. I guess what I'm trying to figure out is why the voltage drops when I replaced both the battery and the alternator. What could be the cause of the voltage drop and whining noise coming from the power steering pulley? (it never made that noise until I replaced the alternator) Ive searched the site for info but I cant quite seems to find an answer. Any help would be extremely helpful. Hopefully together we'll figure it out. Thanks in advance.