Are you talking about the "idler pulley"? They are quite simple to change. Loosen the serpentine belt by using a socket on the center of the tensioner pulley, slide the belt off the idler pulley, use a socket to pull the center bolt of the idler pulley and replace the pulley with a new one.
no there is not.
It is the small pulley with a nut in the middle on the pulley assembly!
Check the alternator if that don't do it change the battery
Remove the alternator belt by loosening the tensioner pulley. Remove the wiring from the alternator. Remove the retaining bolts to the alternator. Reverse the process to install the new alternator.
It is built in to the alternator.
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Defective voltage regulator. It may be built into the alternator.
The serpentine belt on a 92 Chevy Caprice Classic is changed by loosening the tensioner pulley and pulling the belt off. A new belt can then be put in place and the tension restored.