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With the key in the run position, the PATS system has triggered if the theft light blinks rapid 3 times a second. If thats occurring then the PCM or instrument cluster, or transceiver, or key is bad. It can also be caused by an aftermarket electronic in the vehicle or a weak battery. Try your spare key and if that fails then you need a tow to the dealer or a mobile locksmith with the correct programming tool.
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Thanks auto or manual transmission?
With the key in the run position, touch a jumper wire briefly to both wires at the starter solenoid. Does the starter engage, spin the engine (crank) and does it start?
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Remove the starter relay from the fuse box under the hood. One pin should have power. Have a helper hold the key in the start position, there should now be another power pin. If not then see if fuse 24 under the dash has power when trying to start. Let me know these results.
Your using a test light or volt meter, your checking every pin, only one will/should have power with the key off. Below is an image of the relay location.
There should be no sounds when trying to start the truck, are you sure there is not an aftermarket alarm or immobilizer on the vehicle?
Can you check the voltage at fuse 24 when trying to start?
The red/light blue wire from the ignition switch which powers fuse 24 must have battery voltage when trying to start. Can you check this wire tested the same way at the ignition switch? The 4 yellow wires are the power to the ignition switch.
If your battery is at 12 volts then yes. A good battery will have 12.6 volts.
You gotta get fuse 24 that is powered by the ignition switch to have battery voltage while trying to start.