my truck will not turn over on 2005 Chevrolet Avalanche 1500

the battery is new and the connection are tight. When i turn the key it makes no sound at all. the lights are bright and the accessories work fine.

You need to start by looking for power at the starter on the big heavy wire using a volt meter, then look to see you have power at the starter motor smaller wire as a friend moves the ignition key to the "starter position" if you have power in the ignition key starter position then the starter is likely to be bad. If you have no power then the ignition circuit and anti theft/security system side of the starting circuit need to be looked at. If you need a wiring diagram, Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate