My chevy 2004 trailblazers wont start

Are you saying, it cranks good but won't start, or the starter motor won't even crank the engine? The diagnostics are different depending on the issue? I'm just trying to get on the same page. I posted the diagram for your starter motor circuit, but, I'm not sure that's what you need?

When I turn the key to start the truck everything comes on but the engine,I'm unsure if it's the starter one we. Change the battery it started by mistake my son cut if off now it wont start again. When I turn the key I hear a click where they relay starter is .

Replacing components won't do any good if something wrong with wiring circuits? If you can unplug starter relay, you can do testing, there. Any testing, make sure transmission is in park or neutral and parking brake is set. can you read and understand the wiring diagram, I posted?

It wont crank do nothing

The light come on my alarm and horn went off