High pitched whine from the engine at high idle, running speed

[twisted_ed]

When my heep idles, there it sounds fine but as soon as you bump the idle up or go for a drive the noise starts at around 20 Kilometeres and hour and up. I have no idea what it could be, the belt seems fine... I am hoping its not somthing inside the engine, otherwise I am out of a vehicle for awhile.

I was thinking it could be like the power steering pump, belt idler, A/C, water pump (but its new so I doubt it), cooling fan, hopefully somthing easy to replace diagnose like that....

If I removed the belt and started it and reved it for a few seconds, that would elimiate all those components and the only downfall I see is no cooling pump.. but its only for a second, and at least it would tell me if its the engine or a belt driven accessorie.

Edit: I took off the belt and its not the engine, but an accessory so I checked them all. I think its my alternator, I spin the thing and it makes a squeal/whine. Im wondering what I can do, should I replace it now... or wait till it fails

[jeepdude10000]

if u wait to long to replace it , if the bearings seize, it could break the belt and then u loose waterpump, and etc.

replace ASAP

[twisted_ed]

replaced the belt, still squeals but not as much... so since the alternator is the onlyone I get a sqeaul from. guess it gets replaces... 160 bucks down the drain grr..

[1986Comanche]

Yeah I would replace the alternator for sure if you think it's going bad.