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A loose serpentine belt can trigger the battery light by reducing alternator output, but it is not the only possible cause.

Learn the most common reasons a car alarm keeps going off, how to diagnose the issue, and what fixes actually work.

Yes, a bad starter can drain a battery. Learn the warning signs, common causes, and the fastest ways to tell whether the starter or battery is at fault.

Learn the clearest signs of a bad starter, how to test it, and what to do before replacing parts unnecessarily.

Learn the most common reasons brake lights stay on, how to diagnose the problem, and which fixes are simple versus safety-critical.