When you say it isn't cranking, I assume the starter isn't working, correct? Also, the inertia switch has a reset button on it. Have you tried resetting it? See pic 1 below for the location.
Next, I attached the wiring schematic below for the starting system. I need you to first check the fuses I highlighted in the schematic. Pics 4-6 show the fuse locations. Note, in addition to checking the fuses, confirm there is power to and from them. Here is a link you may find helpful:
If the fuses check good and have power, check the starter relay, highlighted in pic 6. If there is another relay with the same part number, switch them. If there isn't, here is a link that shows how to test a relay.
If the relay is good, go to the starter itself. We need to check the smaller wire which should be yellow with a blue tracer in color. That is the smaller wire on the starter. It should only get 12v when the key is in the start position. Have a helper turn the key to start while you check for power.
If there is power and the heavy gauge wire straight from the battery is good and has power, chances are the starter is bad.
Afterthought: Make sure there is power to and from the clutch pedal switch.
Let me know what you find or if you have other questions.
See pics below.
Images (Click to enlarge)
Thursday, October 7th, 2021 AT 8:21 PM