You can tell your alternator is bad by watching for several key signs and symptoms:

• Battery warning light on the dashboard : Often a yellow or red battery-shaped icon illuminates when the alternator is failing

• Dead or repeatedly dying battery : If your battery keeps dying despite being relatively new or after charging, the alternator may not be properly charging it

• Dimming, flickering, or overly bright headlights and interior lights : This indicates unstable electrical power from a failing alternator

• Electrical accessories malfunctioning or slow to operate : Power windows, radio, seat warmers, and other electrical components may act erratically or stop working

• Strange noises from under the hood : Whining, grinding, squealing, or growling sounds can indicate worn alternator bearings or belt issues

• Burning rubber or hot wire smell : This can occur if the alternator is overcharging or overheating wiring

• Engine stalling or trouble starting : If your car starts but stalls shortly after, or has trouble starting even after a jump-start, the alternator may be failing to supply power to spark plugs and electrical systems

• Voltage gauge reading low or abnormally high (if your car has one): This can signal alternator problems

• Car vibrations while driving : Caused by misfiring spark plugs due to insufficient electrical power from the alternator

To confirm, you can test the alternator with a multimeter: start the car and measure battery voltage at the terminals; a healthy alternator should produce about 13-14.5 volts. Readings outside this range indicate charging issues

. If you notice one or more of these symptoms, it’s advisable to have your alternator checked and repaired promptly to avoid being stranded