2012 Hyundai Tucson - Dead battery

If the battery is good and connected to the wiring harness properly the problem is most likely either the ignition switch, neutral safety switch, an anti-theft system, or a blown fuse. Ask your shop to measure the voltage at both starter terminals with the key in start. Both should measure at least 10.5 volts. What do yours measure? Pardon the pun but that’s where to start.