On many cars there are multiple relays clicking at various times. If you're sure the starter relay is clicking, that does indeed point to the starter, but there is also a fuse in that circuit. If the starter had been working, then not working intermittently, that rules out the fuse as they will never be intermittent.
Find the smaller wire on the starter and check for 12 volts there while your helper tries to crank the engine. If the 12 volts shows up there but the starter doesn't spin, or it spins after you tap it with a small hammer or wrench, the solenoid is sticking. The housing can warp and cause that. The best solution is to replace the starter motor. You can replace just the solenoid instead, but they can be harder to find. You still have to remove the starter to replace the solenoid on it.
Thursday, February 16th, 2017 AT 7:19 PM