My Jeep wrangler 2.4L whines loud (high pitch at high RPM, lower at low RPM). There
are no ghostly electrical problems (dims, can't start, etc.) Under the hood,
it seems to be coming from the alternator area. I read that an alternator can
whine if there's a bad ground. I checked all my aftermarket stereo equipment
and it's still there.
I took it to a Jeep dealer and they claimed they couldn't hear it. They came back to the waiting room and said they think they found it. A chipped pully and horizontally sliced belt. $300 later, they replaced both. Sound is still there and got worse.
What is best course of action? Can it just be the bearing of the alternator?