Why does it kill every battery even new overnight an won't even jump

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. It sounds like your Tahoe has a serious case of the electrical gremlins. When a battery dies overnight and won't jump, it's often due to a parasitic drain—something's drawing power when it shouldn't. The repetitive clicking you heard could be a relay going haywire, stuck in the "on" position, or a sign of a faulty starter solenoid. Given that even a fresh battery drains quickly, I'd suspect a short circuit somewhere or maybe a power-hungry accessory like an aftermarket stereo or alarm system. The best way to track down the culprit is to test amperage through each circuit while the power is off. If you need more advice, have any other questions about your vehicle, or want to connect to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!