Mines starting to make similar noises, started off minor and quiet...But now it squeels. Only when my Cabin fan is on 3rd or 4th notch, and rear defroster on. I'm sure hoping its just a loose belt, cause everything attachted to it was just replaced during the; Fried Piston Rings/oil starvation-Rebuild-Forge-big boost. Something that bothers me is that I have a 1000w amp with no cap(dumb i know) and can pump it with no dimming lights, but when i roll down my windows everything dims, and when i turn on/off headlights, or defroster, or fan the engine either makes a slight strain noise aka minor elevation in idle rpm, or sounds like I just took the gag out of its mouth-reduced engine strain.
Now i know those things will add some extra load to the electrical system, but why is it so noticeable? During the cooldown period i experimented with this, and turned off the lights, fan, and defroster at the same time, wow. I know the fan makes noise, but even if the fans off and I turn off defroster or lights or both it still does it. Would an aftermarket grounding kit possible help with my flucuations?