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The 2012 GMC Terrain may experience alternator issues, such as dim lights or failure to charge the battery. Eventually, this component may become ineffective, requiring a replacement battery every 50,000 to 60,000 miles. Though it may be costly, you will need to invest in a new battery to maintain your vehicle's functionality. Throughout the vehicle's lifespan, battery problems could arise, including leaks leading to fluid spillage or sudden failure. In such cases, recharging or replacing the battery becomes necessary. Cracks in the battery case may also develop, necessitating a complete replacement. Quick drainage of the battery can occur, requiring prompt attention to resolve the issue.
If the alternator in the 2012 GMC Terrain is faulty, the battery won't charge, causing the vehicle's electrical systems to stop working.
I had to switch out both alternators and batteries for my 2012 GMC Terrain within just 8 months.