Water on belt dont effect noise. Pressure on belt and on each accessory pulley and tensioner/idler dont effect noise.
When I unplug the 3 wire alternator plug the noise stops. When i plug it back in, the noise starts immediately for 1/2 a second, then stops for 3 to 5 seconds before starting again.
once noise starts it does not stop.
The alternator usually starts making this noise after engine warms up for 10 to 15 minutes. Once in a while the noise starts after 2 minutes from a dead cold start. Just today for the 1st time it ran for 37 minutes with NO noise, then i shut her down for 2 minutes and restarted the engine, then after 45 seconds the noise started.
2 different screwdrivers touching front, mid section and rear of the alternator, with other end in my ear and I hear nothing. Same with short hose touching or just very near alt. (same with all other pulleys)
I cant reverse spin the Alt coupler pulley clutch\decoupler, as shown in this video. See
https://youtu.be/1Duj1jh1rlA Mine behaved like his. If this is even a proper test for a toyota. My noise does sound like The Drake alt coupler pulley clutch\decoupler here: See
https://au.toyotaownersclub.com/foru...m-engine-area/ Although mine also sounds like this alt rear bearing noise here:
https://www.youtube.com/watch?v=dTNM5X7ufk4
Separate issue:
Turning accessory pulleys/tensioner/idlers by hand with belt off and hot engine I hear no noise, see no wobble and feel no oddities. Pulling/pushing them in and out, laterally back and forth(rocking), and laterally side to side I feel some play. Some more then others. pwr steer pump moves in and out a lot. tensioner same but less and also side to side. wtr pump moves in and out, but less so and rocks back and forth. AC comp moves in all 3 directions, but not by a lot. Upper idler rocks back and forth more so. Lower idler rocks back and forth just a little. I don't know how much is acceptable/normal or if I should be concerned about some of these. The Alt I could feel no play.