Hello I will help you with your question,

A couple of questions;

How do you know the starter and battery are good?

When you checked for power to the starter did you check the small wire at the solenoid for power when you turn the key to the start/crank position?

Can you turn the engine over by hand with a socket wrench on the crank pulley?

Your starter may have failed or the engine may be locked up.

Have you driven through any deep water or had any starting problems before this?

Let me know the answers to my questions and I can tell you why your engine does not crank when you turn the key

Thank you

Ok then I have a much clearer picture of what is happineng,

There is no relay in this sytem so when you turn the key power goes to the neutral safety switch on the clutch pedal arm or through the range switch mounted on your transmission before going to the starter solenoid.

If you have no power at the solenoid when you turn the key to the crank position try using a large paperclip to jump the switch. Jump from the blue to the blue wire if you have a manual transmission or from the blu to the red wire if you have an automatic.

The hum you hear may be the starter solenoid so you will have to be sure you have a good connection from the battery to the starter by measuring from the battery positive post to the large terminal at the starter while cranking, you should not have more than 0.5volts between these two points while cranking. If you have more the connections or the cable are faulty and need attention. This must be done while cranking.

Let me know what you find with these two tests

Thanks

The blue wires are on the switch at the clutch pedal arwm if you have a manual transmission or on the range switch that is mounted on the top of the transmission if this is an automatic (the wires are red and blue in that case)

You can also use the paperclip as a point to measure the voltage as you turn the key by inserting it from the backside of the connector along the wire. If you have voltage at the paperclip you should have voltage to the starter solenoid.

Be careful as if you jump the switch while the transmission is in gear and the starter motor turns the engine the vehicle will move.

I'm guessing from your description that you have an automatic transmission?

Connect from pin #9 (blue) to pin #6 (red) in the range switch connector diagram posted below

If nothing happens and you get power to the small starter post check the large battery cable and run a jumper cable from the positive post to the large starter terminal if needed. If the starter still won't turn you need to replace the starter as it has a dead spot.

If you can jump to the small terminal and the starter spins the engine and you get power at the small terminal when you have the jumper out of the range switch then the starter turns the engine and the engine starts right? Or am I missing something here?