If your 2014 GMC Terrain has a dead battery, you'll need to jumpstart it. Here's how:
1. Park the good car next to the Terrain and turn off both engines.
2. Open the hoods and locate the batteries. On the Terrain, the battery is on the driver's side.
3. Connect one end of the positive (red) jumper cable to the positive terminal of the dead battery. Then connect the other end of the positive jumper cable to the positive terminal of the good battery.
4. Connect one end of the negative (black) jumper cable to the negative terminal of the good battery. Then connect