318 chirping when at idle

I have a 318 Dakota with 75K miles that has developed an almost constant 'chirping' sound when stopped in gear or in park at idle. It sounds like maybe
a bearing making noise to me. With the engine running, and listening to the devices on the serpentine (alternator, power steering pump, compressor, etc.) using a block of wood, the only thing that sounds abnormal to me is a grinding noise in one of the tensioners (I'm not sure of it's correct name but it's one of the pulley's that guide the serpentine belt). Am I going down the right path here? Or might it be something else? If I'm right, what are the implications of not replacing it? Can it just be lubed? Thank you for any advice you can give.
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sounds like your on the right track. your going to be looking for something making the belt track off or not hold proper tension. if the idler is leaning then the belt will track out of correct position and squeal or chirp, if the tensioner is locking up then the belt will do the same. simple check grab the belt near the tensioner (rh/passenger side of the truck between the alt and crankshaft) give the belt a firm pull the tensioner should deflect and quickly return. if you are unable to move the tensioner by pulling on the belt or if you move it but it doesn't readily return then the tensioner is locking up in its pivot and is not keeping correct tension on the belt. also check your power steering pulley it should be pressed onto the power steering pump shaft such that the shaft and end flange of the pulley are flush if they are not then the pulley has walked off the shaft some and could be a cause, I've seen this a time or two. hope this is some helpful information.
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