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Starter,alternator,radio, and the dome lights are the biggest causes of a drained battery. Starter being the worst. If it is slow or sounds louder than normal, I would start with the starter.
Is power getting to the ignition switch? Do the warning lights and gauges come on when key is turned to on? That would verify power in and power out at the switch. Then you would need to check the start circuit. A single start wire comes out of the switch, the signal travels through the neutral safety switch and a starter relay and then to the starter solenoid mounted on the starter. Solenoid closes contacts so battery power can operate the starter. If new starter doesn't work, power has been lost between the ignition switch and the starter. If no power to the ignition switch check maxi fuses, all fuses in fact, and possibly a fusible link from the battery that may be the feed for the switch.
If the engine is turning over than none of the things you replaced will make the engine"start".
You will need to check for fuel pressure and spark first.
2 things come to mind, first check and clean all battery and starter connections. second, maybe you have something draining the battery. next time it rolls slow, put on a battery charger and see what happens. also, even though it is a new battery, it still could have a weak cell.
have your alternator checked. your chevy is probably running on the battery which is probably only receiving a particle charge from the alternator. I had a chevy did the same thing when ever the alternator was going out.
Pretty sure you have a dead battery. The radio and lights may come on, but if the capacity to start is not there, the starter will not turn. There is no such thing as a locked starter, as you describe.
I have the same problem. One day my truck worked great and then the next day it just wont start. I replaced the 12v battery but still no start. I also have a 2005 chevy silverado hybrid.
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