Final answer:
To engage the starter button, the engine key must be turned to the 'on' position, activating essential electrical systems before starting the engine.
Step-by-step explanation:
If your truck has a starter button, you must first turn the engine key to the 'on' position before engaging it. The purpose of turning the key to the 'on' position is to activate the vehicle's electrical systems, including the fuel and ignition systems, which are necessary for the engine to start once the starter button is pushed.
Unlike traditional key ignition systems where a single turn of the key initiates the engine's starting process, vehicles with a starter button require this two-step process to ensure that all the necessary systems are powered before the engine attempts to start.