I DON'T HAVE ANY LIGHTS ON,NOR IS MY KEY IN THE IGNITION,BUT MY BATTERIES KEEP GOING DEAD.ANYONE ELSE ? THANKS IN ADVANCE

 

How long is it taken for your batteries to die, overnight? in a hour. If you have one bad battery, it will draw both down. Take the batteries and get them load checked. Also, may be a bad alternator. We need some info on your truck to help you out, year?

 

It's An 06, And It Was Dead After Sitting Overnight.

 

I think there was a flash/TSB for this problem. I can't remember. It happened a good bit when the 06's were new.

 

I Have A New Ecm,if That Means Anything.

 

Are there any electrical accessories that could be drawing the batteries down?

If not, is the truck (and batteries) still under warranty?