I'm wondering if the issue I'm having with my alternator could be similar...my headlights will surge when I'm rolling the windows down or up, but the biggest issue I'm having is belt squealing when there are too many loads on. Headlights and radio is fine, A/C comes on, squeal...cigarette lighter pushed in, squeal...I also get the occasional squeal on startup. I've discussed this a little bit with you @pcb, and remember you saying it's a known issue, the tightness on that particular belt...too tight and the alternator pulley starts to fail, too loose and it squeals...
I'm wondering if I should do the "Big 3" as well as a reman/new alternator..? I just wanna use my A/C, Texas is HOT right now!!!
