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I had the same problem with my 2000 Yukon. I disassembled the tail light and pulled the bulb contact strip out. The dielectric grease on the sockets were dried up and hard. It had caused a loose connection and overheated the plastic. I managed to clear the old grease out with a pick tool and brake cleaner. I put in new grease and it still works. I noticed later that Advance Auto has the contact strip for sale. I hope this helps.
Hi. I have posted a procedure below that will help you isolate the actual drain. follow carefully.
Here is the procedure I use to isolate a battery drain. Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or "light" if there is a drain. If the "light or glow" is faint, that is probably normal draw for the clock or computer. If the "light or glow" is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. Remember to hold in the button in the door jam for the interior lights.