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Theres a bunch of engine sensor that can prevent the computer from firing. If you lost prime and theres no fuel at the pump that can throw an error. It wont open the injectors but I think it would let you crank. You can try to crank it from the starter with the dash switch on and see if it...

If the engine computer isnt happy it wont open the injectors. If you have a heavy code reader you can plug into engine diag and see if any codes. A1 trucks its not always a simple diagnosis.

Are you sure you have fully charged batteries and all the connections are good?

Arrow up and down at same time in n on keypad see if there are codes. Grounds usually under the power panel right side is a big grouped ground. You an try sanding the connections and making sure its all tight. Does it run and drive if you start it from the starter?

See if any trans keypad error codes. Trans error can inhibit start. Or dash grounds.

You bypassed all the safety relays like neutral start

Button left side of the breaker panel. Says start inhibit.

Drivers side of the engine its on the fuel pump. If the truck starts then its working.

Its accessed behind the passenger kick panel. No fuses. You need to start small. Does the fuel solenoid work with the dash switch? Engine ecu power also? 24v at starter? Can you jump the start solenoid and crank the engine?

In the first gen trucks the VIM module will cause a no start if the trans ecu sees something it dosnt like. You can open the vim and use a jumper lead to bypass each relay one at a time. In the A1 trucks there is no VIM the trans ecu does it all.

There is no "it's this" forum answer for your issue. And I don't have an A1 troubleshooting manual. The cat dealer should be able to plug into and run diag on the truck.

Don't you have another thread on this? His truck is an A1 so a bit more to this. You need to diagnose. Does the fuel solenoid engage when you turn on the power switch? Do you have proper power to the engine computer? You can jump the starter solenoid to crank the engine. If it has fuel and the...