Engine whine (especially when revving up)

Note: This is for my Tundra.

So I just noticed earlier today that my engine is whining. I've had a supercharger for almost 2 years now and the whine is noticeably different/louder. Initially my guess was that it was my alternator but now I'm thinking it's one of the idler pulleys (#1, tensioner, or SC idler).

Backstory..

Went offroading in Anza-Borrego this Sunday. We were on our way out but ran into a decently deep yet very watery mud bog around 7p (pitch black) that stretched for almost a quarter-mile. I made it through with the help of my supercharger, 37s, and lift clearance (other guys had to be pulled off trail up onto higher ground). The mud was very soupy and on average almost halfway up my rear axle (I have the diff breather relocated to behind my taillight).



The drive home and all day Monday I didn't hear any whining. However, on Monday I cleaned the engine bay with a degreaser (Simple Green) and water; I let the engine cool for about 15 minutes, sprayed degreaser on to rest for about 5 minutes, rinsed the whole bay, repeated steps one more time. Today (Tuesday) is when I started hearing the whine.

Could the degreaser have gotten between the pulleys (IIRC, they have grease around them) and caused the whine? Or would that sound more like a squeak?

The reason why I'm doubting it being the alternator is because I've been in water deeper than that several times and never had issues..



Or maybe my drive belt is bad now (I have a new one coming in Monday so I can swap it out then for good measure)?

 

Yeah I'm having a similar issue. Went off roading a few days ago and hit some mud in cleghorn and Liebre mountain. After a day I started noticing a whine cone from my engine that sounds like a supercharger. I haven't decreased anything like you have but was hoping it was one of the belts.

The whine sounds tied to the engine RPMs and is quieter at idle but still very noticible. I'm going to have my buddy who's a mechanic check it out and I'll post back here

 

So, updates..
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Finally got a few hours of daylight and time to do more investigation, while waiting for potential replacement parts to come in, and here's an update..

More importantly, it does seem like I have two separate problems since washing the engine bay with degreaser and water: whining sound and battery voltage.

The alternator doesn't even have any signs of mud on it nor did it get any of the degreaser/water dripping down it..



I cleaned the battery terminals and body ground with an acid neutralizer and wire brush; then put some protective battery grease on them..



I've used a stethoscope and tube method to pinpoint the sound toward these two pulleys (the supercharger idler and #1 idler)..



..is the supercharger idler the same as the tensioner idler? I couldn't find information on that online or on the forums. Here are the replacement parts that came in that I may or may not need to use..



..and lastly here are the results of testing the battery with a voltage meter (I need to get around to testing the voltage directly from the alternator as I think that should tell me if the alternator is good if it reads ~13v)..



..anyone have any other thoughts after the new information?
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I got a video of voltage testing while revving the engine, it looks like the alternator is charging fine..

https://www.youtube.com/watch?v=u8VVtjksjB4

..the dash panel voltage meter still reads bad (see picture I posted previously) at idle and all RPM ranges. Is that the voltage regulator? I don't think it's a alternator fuse because the volt meter wouldn't read "charging." I thought about trying the jumper cable from alternator positive to battery positive test but that only tests a bad alternator fuse, which is good now since I'm getting a 14.5v reading above 2,000rpm.

 

Here's a video of the whole instrument cluster panel as I cycle from engine off to on..

https://www.youtube.com/watch?v=_iC9-bf_7IQ

These are the readings without revving the engine..

 

Hey bud, finally got mine fixed at the dealer ship. Had 2 idler pulleys that went bad (bad ball-bearings causing the whine). Looks like you already figured that out tho.