Usually a starter will click multiple times if it isn't getting the power from the battery like it should. What I see all the time is the solenoid will lock up and all you get is a single click and after cycling the key several times will sometimes start. A quick check to see if it is the starter solenoid, is to tap on the solenoid when you try to start it, if it starts i'd say its the solenoid. If not.... well could still be but you could have other issues. If you want to go through the hassle you can remove the starter and have it tested.