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Q:My mechanic informed me that my 99 Suburban K1500 5.7 ltr. had a drain on the battery while sitting. The other day the battery was dead, not even enough juice to operate the door locks, I heard a clicking coming from under the dash (sounded like blinkers) but it was coming from the Transfer Case Control Module or TCCM. Is the TCCM defective and causing the drain or, is the drain being caused by something else and the lack of charge in the battery causing a non-defective TCCM to click?
A:I'm happy to help, Neil! A mechanic would be able to better diagnose this as they will be able to test the electrical system of your vehicle. Without being able to see the vehicle and test electrical connections it would be difficult to diagnose. It's even possible that over time a wire could have broken and shorted. Strange things can start happening once there is a short or parasitic drain on the battery.