2005 GMC Sierra when i put in the accessory position to wait for glow plug indicator

When i try to start truck and put it in the accessory position on ignition it tries to start instead of being in accessory position. Is the starter going bad? Battery?
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These types of problems can be tricky. I don't think starter or battery is the issue, based on what you described.
It sounds like you are using the wrong terminology--the "accessory" position is when you turn the key toward the driver; the first click toward the dashboard is the "ON/RUN" position and the last, spring-loaded position is the START position. So it sounds like the car tries to start when it's only in the ON/RUN position.