All morning the truck seemed like it didnt want to start very bad. then i went to get in it to start it and it acted like the battery was dead with the very slow crank. my brother came to jump me and it didnt work. Now it doesnt make any noise when you try to start it. the battery charger says the battery is charged and it is only 3 weeks old. not sure what is wrong. any ideas?

 

Check both battery cable connections at the battery (clean as needed). Check the positive cable connection at the Power Distribution Box and starter motor, ensuring there clean and tight. Check the ground cable connections at body and engine block, ensuring there clean and tight.

If all the above are good and your sure the battery is charged, try the following:
Turn on headlamps and try starting. Does the headlamps dim or go off during starting?
If they stay bright or only slightly dim, look for starter control problem (Safety switch, starter relay, or solenoid). If they dim or go off, look for problems with the battery, cables, starter relay, solenoid, or starter motor.