No start

The PCM. I have turned your question over to someone who has more knowledge of your issue.

When it does not start, has the fuel pressure been checked?

That is interesting considering everything seems to be related to the fuel supply. Have you checked to make sure the engine is getting a good spark when it will not start? The spark should be a hot blue snapping spark.

Is the security light on solid or flashing when the truck doesnt start?

Hello,

It is not the injectors it sounds more like a engine coolant temperature sensor which when gets a little off it will not trigger a check engine light e so most paces miss it.

Here is a guide to help you see what you are in for when doing he job:

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Here is the location for your truck (below).

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken

Forget the starter. That has nothing to do once the engine is running. The dimming headlights and confused computers/warning lights are the classic symptoms of a failed charging system. Charge the battery at a slow rate for an hour, then once the engine is running, measure the battery voltage with a digital voltmeter. You must find between 13.75 and 14.75 volts. If it is low, suspect the alternator, but there are a couple of quick tests to verify that before you spend money on unneeded parts.

You said there is no voltage on the starter's solenoid wire, but you did not say when. Are you expecting it to be there when the ignition switch is in the "run" position?

Measure the battery voltage with everything turned off and holler back with that number. Have you checked for blown fuses? They often blow when connecting a battery due to the current surges of the many computer memory circuits charging up.

The battery is not fully-charged. A fully-charged battery will measure 12.6 volts. A good, totally drained battery will measure 12.2 volts. Measure yours again with the head lights turned on. I am leaning toward the voltage dropping down when the ignition switch is turned on, to the point the computer won't turn on the starter relay.

No matter what the people at auto parts tell you a pro has to use his scanner to put all the security stuff in and it will not let it start until that is done.