When I turn the key it only clicks, starter does not engage

It's either a bad battery (low on charge) or a loose ground wire. If you are SURE that the battery has 12 volts (yes, even a low battery will run your lights, radio, door ajar chime, etc., but won't have enough to start the car). If the battery is fully charged and your volt meter shows 14.4 volts (fully charged battery reading), then it's a ground wire. There are two locations. The negative battery cable itself on the battery, and the location on the frame or engine where the cable connects to.If these are ok, check the positive cable connection on the starter.