Getting power to the key

Just to be safe always check the obvious, make sure you can rotate the engine over with a socket/ratchet to be sure it is not seized, then check to be sure the hot wire to the solenoid ( big wire to stud on solenoid) has battery power with key in run position, check for battery power on the starter solenoid (small wire to activate solenoid) with the key turned to start the vehicle, , there should be power at the solenoid to engage the starter motor, if no power on the large wire trace back to find fault, same for the solenoid power from key, but from your statement of a click when trying to start sounds like solenoid is engaging . so either the power to the starter from battery seems to be open or to low voltage getting to starter from corroded wires, or the engine could be seized.

If the battery is good, then there should be power at the starter solenoid. The solenoid is connected to the starter.The solenoid is energized by the ignition key. When the key is turned, the starter solenoid allows power to feed the starter. Try tapping the starter solenoid while turning the key. Have a friend help and use something non metallic to tap the solenoid. Good luck!

Is the solenoid getting power when it shouldn't be ? Faulty key switch ? The solenoid should only get power from the key switch in the start position.
Was the problem happening before you replaced the solenoid and starter ?

Check starter solinoid

I am assuming that the starter will not crank over when you turn the key.It sounds like the starter solenoid is toast.Get a meter and see if there is power to the solenoid when you turn the key.It will be the smaller gauge wire .If you have power to the solenoid and you get no cranking then you will have to replace the starter(they are one unit)

on the relay there will be a small wire that gets power when you turn the key to the start position
find that wire and connect it to the small terminal of the starter solenoid
then if you get it right , when you turn the key to start, power will get to the starter solenoid , energize the solenoid and the starter will engage

First check to make sure the starter solenoid is still plugged into the wire harness and is getting power when you turn the key. Tap on the side of the starter gently with a hammer. If you turn the key and the starter works you just need new starter brushes. If the solenoid does not click when you turn the key just replace the whole assembly , the solenoid is bad (It's part of the starter).

The starter solenoid sounds to be bad. Follow the + cable from the starter and it will lead to the solenoid. This is usually about $10. The battery produces power to the solenoid which then produces power to kick the starter over. The clicking is the contacts in the solenoid you are hearing.

Most likely bad cell on battery with not enough amerage or the solenoid on the starter is going bad. Turn car to on and Jumper the solenoid if it starts replace starter as that part is hard to get on its own.

Hi Tonymcder;
Here's what happens in the start sequence when ypi turn the key.

When you turn the key, you should at least hear the starter solenoid click. When you turn the key the ignition switch sends 12 volts to the Starter solenoid ( really just a relay). The Solenoid closes and applies 12 volts (at a high current) to the starter motor to crank the engine. If you have a way to measure voltage, you should get 12 volts at the small terminal on the starter solenoid. The solenoid is mounted on the top of the starter motor.If you get
no voltage, probably an ignition switch If you get 12 volts and the starter doesn't crank the starter is probably defective. At this [point take a small hammer and tap the starter motor, not hard, just medium. Sometimes this will cause the starter motor to catch next time you turn the key. Best bet is to remove the starter motor (with solenoid attached) and take it to an Auto Zone type store where they can check it out for you. Be sure you disconnect the ground terminal of the battery before you attempt to remove the starter motor.
Hope this helps Loringh Thanks for using FixYa