2002 chevy trailblazer?

[ramsey]

The battery keeps going dead over night installed new battery installed new alternator and keeps going dead any one have any ideas?

[nydp02]

maybe aftermarket radio or alarm or light is staying on and you are not ralizing it.

[John L]

You need to test it for a draw something is drawing a good bit of power to kill a battery overnight. Do you have any after market electronics? anything that can draw power from the battery overnight? I had a trailer harness that was drawing power and would kill my battery one time.