Question: how do you know if your alternator belt is loose?
Answer: 1# Squealing Noises. A squealing noise for a few seconds when starting the engine is a surefire way of telling that the alternator belt is slipping. ...  2# Battery Warning Light. A loose alternator belt means that the battery does not get adequate power. ...  3# Blinking Lights. ...  4# Dead Battery. ...  5# Stalled Vehicle.