Outside of the battery warning light, a dead battery is the most common symptom of a bad alternator. Also, some vehicles have an “alt” light that specifically tells you there is a problem with the charging system, and not the battery itself. ![]() In rare occasions the service engine soon light may light up. The battery light is designed to tell you that there is not enough voltage to properly charge the battery, or that the battery itself is not holding the proper voltage. Here are the most common symptoms of a bad alternator in a Pontiac Vibe: A typical alternator Battery Light It’s the labor that makes the job expensive. Most of the time, when replacing an alternator, the alternator itself is relatively affordable. Symptoms of a Bad Alternator: Pontiac Vibe You’ll have probably heard it squeal when you start the engine. If it’s been slipping a lot it’ll have a glossy shine to it. It’s worth noting that a bad serpentine belt can cause the alternator to stop charging effectively. The battery stores enough voltage to be able to start the engine without the assistance of an alternator. ![]() The alternator’s job in your Vibe is to provide electricity as it is running. We’ll cover the symptoms of when an alternator goes bad, and how to diagnose a bad one (which is really pretty easy). Alternators don’t always go bad in the exact same way. A bad alternator can leave your Pontiac Vibe without power and unable to move.
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