Obvious Signs:
* Battery light comes on: This is the most common and reliable indicator. The light usually illuminates on the dashboard and will stay on, even after the engine is running.
* Dim headlights/interior lights: As the alternator fails to recharge the battery, the electrical system will draw power from the battery, causing lights to dim, especially when idling or using other electrical components (like the radio or AC).
* Engine stalling/difficulty starting: If the alternator completely fails, the battery will eventually drain completely, leading to the engine stalling or failing to start.
* Electrical system malfunctions: Other electrical components might start malfunctioning due to insufficient power. This could include power windows, power locks, or the radio.
* Strange noises (whining, squealing): A failing alternator can produce whining or squealing noises, especially at higher engine speeds. This is often due to worn bearings within the alternator.
Subtle Signs (These might indicate a problem *before* complete failure):
* Battery consistently needs to be jumped: If you find yourself frequently needing to jump-start your Malibu, even if it seems like it should have enough charge, it's a strong indicator of an alternator problem.
* Faster than usual battery drain: Noticeably shorter periods between charges might suggest the alternator isn't keeping up.
Important Note: While these symptoms are suggestive, it's crucial to get your alternator tested by a qualified mechanic to confirm the diagnosis. Simply observing some of these issues doesn't definitively mean a bad alternator; other electrical problems could cause similar symptoms. A mechanic can perform a proper test to measure the alternator's output and determine its health.
