Think what you will!
My LC 200 y 2000 284k has been low humming,for 2 years but voltmeter showed new battery and old alt doing just fine at 12.+ Cold and 14.+ With engine on...
All the way to this morning!
2 mechanics 2 yrs ago at maintenance said they couldn't hear the low hum nor replicate...
Long time lurker here.
99 with 303k miles. Running an Ironman stage 2 lift with the diff drop, KO2 285s.
I have a hum or could even call it a growl that’s most noticeable at 40mph+. Becomes higher pitched with increased speed, and lower pitch/ louder during deceleration. Braking has no affect...