Battery draining during 48 hours when parked

2CarPros.

Thank you very much for your step by step guide to solve the electrical problems with my Hummer H2, model 2006. I will now have my mechanic duly follow your detailed instruction.
When the problem is solved I will return with information.

Best regards
Svein Steinmoen

Thank you very much for your advice. My mechanic disconnected the radio. He believe this was the most likely culprit. I have used the Hummer every day since, but still don't know what will happen if I don't use it for a couple of days.
I have seen a double battery pack advertised for H2. Would that be something I should consider?

Best regards and thanks again!
Svein Steinmoen

Hello 2carpros.
Very well. I will follow up with my mechanic, Thank you for good advice and your time!

Best regards
Svein Steinmoen

Thanks to 2CarPros for advice. My problem with constant battery draining in my Hummer H2 model 2006 is now solved and I thought by sharing I might help others. My mechanic finally discovered that the fault was in the ignition lock on the steering column. He discovered it by chance when he bumped into it while looking for the fault elsewhere in the interior. The red light for the battery came on. A new ignition switch was bought and installed, and all is well now. Cheers - Svein Steinmoen