charged with burglary of a buidling.

I have been charged with burglary of a building I was driving down a road and seen something on the side of the road look like a broken air conditioner as I examaned it i seen a water pump on he side of the generator thought it was junk so i took the water pump and put it in the trunk of my car and was leaving the generator cop pulled up and shined a light on the gate and seen tracks leading to the generator I DIDNT DO IT!!!! and they charging me with burglary of a buidling do to it was extremly dark I didnt see the tracks he shined his lights and we both seen it. he question me a whole lot without reading me my miranda rights and now i have burglary of a building against me please help I was going to the navy i didnt have a warrent when i called but my navy recruiter called after me to verify it now i have a warrant Please Help I want to fight for our country but now i have to battle this in court IM INNOCENT..26 years old never been in trouble