My 2006 Tribeca keeps draining the battery. I've been through 3 batteries already. If I don't drive it for 2 or more days the battery is drained and either doesn't turn over or after several tries does turn over. Then my check engine, cruise control, and traction lights come on and stay on. No one can seem to figure out what is wrong. I have to drive it everyday or just let it run in order to keep a charge. Could it be the computer system, electrical, fluids, lights, what do you think?

or any of several reasons:

• You accidentally left the lights on or some other accessory that pulls power from the battery even when the ignition key is off.
• The battery is not being recharged while the vehicle is being driven (you have a charging problem)
• There is a key off parasitic electrical drain on the battery because a relay is sticking, a module is not shutting down, or there is a shorted diode in the alternator.
• Your battery is old and will not hold a charge anymore. The battery needs to be replaced.

Dont take no notice of the computer check its probley the alternator draining the system. it can happen may work ok but can drain back through the regulator. hope this can help.