truck wont start!!!!!

I have a 2006 dc 4x4 and it wont start. When i put the key in the ignition the lights come on the horn works radio works. But when i turn the key to run everything stops working and nothing happens. Also, when i press the brake pedal all the power shuts off. PLEASE HELP ASAP

 

make sure your battery cables are tightly secured onto your battery.

my neg terminal wasnt tightned down all the way once and my truck wouldnt start

 

sounds stupid but you have it in park or the clutch in right?

 

battery is fully charged and terminals and everything is good and i made sure to push the clutch all the way in and even tried using the clutch start cancel button.

 

How do you tell the battery is fully charged? You need to take it to an auto parts store (jump start it) and have them do a load test on the battery. It can have have enough juice to turn the radio (ect) on, but still not be able to turn your starter over. All your symptoms point to dead battery or bad alternator.

 

+1, I'll vote for the battery

 

the anti theft light does stop flashing and how would i know if i had the security thing that disables the starter going to get battery tested now truck wont jump start either

 

disconnect the battery for a min or two and then plug back in and try again

 

Sounds like there's not enough juice in the battery.

 

new battery worked thanks everyone for the help

 

Lmfao