Could be the relay or bad battery cable connection at the battery or relay.
Usually when a starter solenoid/relay switch is bad, you will hear only a click and the starter will not spin (crank).
On the starter. It's actually a PART of the starter. If it's not engaging at all, (no click) it could be the keyswitch, a dirty or loose connection or the neutral lockout switch.
Do you have any click in the starter itself but still not turning over? Then its the starter giving you fits. Replace it. If no click is heard then it could be a fuse or more likely the starter relay. Check them both before moving to the starter.
It can be a dead battery, or a bad starter, the click sound you hear is from the starter relay mounted on the inner fender near the battery, use a test lite and make sure power is coming out of the relay and going to the starter, always replace both the starter and relay if either is found to be bad
Make sure the relay is supplying the 12 volts to the starter - if so remove the starter and go get a rebuilt on to replace it or learn how to repair it yourself.
Click on the link below Click on Owner Guides The Owner Guide ( which includes a diagram of the power distribution box in your engine compartment and servicing instructions ) can be viewed online ( relay # 56 is the starter relay )
Batteries don't "click," but other parts do. If you're hearing that "click," it's probably the starter solenoid trying to engage. Either the battery's charge is low, the starter solenoid has failed, or the starter motor itself has failed. On some older cars, especially Fords, the "click" could also be a remote starter relay.
It may be possible that the wire connections on the starter or battery are broken or corroded. It could be your starter relay. Or your starter should be tested to see if it needs replaced.
It sounds like the starter relay is the clicking sound. Check to see if power is leaving the relay when the switch is turned to starting mode.
Click on the link below Click on Owner Guides The Owner Guide ( which includes the fusepanel / power distribution box diagram ) can be viewed online - starting on page 176 Relay # 307 is the starter relay
Could be the starter relay
It could be a starter problem....can you tell where the click is coming from? is it the started clicking, or a relay clicking?