Just wondering if this happens to anyone else?

The "whine" that my walbro makes changes when the voltage drops. Usually this is if I press two of the window buttons at the same time (like if I try to roll up the passenger and driver window at the same time) My voltage drops from 14 to about 12 and the idle also drops from about 1100-1000 and oil pressure drops a little bit too. Is it normal for idle to drop when the voltage drops?

BTW I have no sound system or anything... I can take a video of it if that helps. Just wanna see if it's normal, or if it's injector scaling related, fuel pump problem, battery related, or alternator problem

 

Its normal...the voltage draw makes EVERYTHING change. Your headlights, dome lights, fuel pump will all dim or change tone.

 

Does anything happen with your AFRs?

 

Voltage is dropping because idle RPM is dropping, idle is dropping because the alternator is putting more load on the engine.

 

Well, my AFRs are always moving around between 14-15 ant 16-18 (cams?) at idle but nothing too drastic happens with the AFR when the voltage drops.

Thanks for the replies guys