I have a 2000 dodge ram 1500 put the keys into start it no lights come on no radio no nothing what is the problem?

Hello, sounds like the 12 volt engine battery should be checked for state of charge and the ability to sustain a load. Sounds like it might have enough reference voltage to light the interior lights with the door open, but not enough for anything else. That's a starting point. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops