If you suspect a charging system problem in your Hyundai Terracan, there are a few steps you can take to diagnose the issue. Start by checking the battery terminals for corrosion or loose connections. Test the battery voltage with a multimeter to ensure it is within the proper range. Inspect the alternator and its belt for any visible damage. If the problem persists, consult your Hyundai Terracan automotive repair manual for detailed troubleshooting procedures.