Help I got a draw

[hugger6933]

On a 04 Avalanche. I have unhooked the neg cable and placed my test light one side on the cable the other to the neg term at the battery. I have unhooked one at a time every single fuse and relay and even the breaker. I also unhooked and unplugged the alt, yet still the test light shines. I rolled down the dimmer[heard that some GM had that as a problem] yet I still have a lit test lamp. Any ideas where to look I'm stumped. This truck has nothing extra added to the electric stuff it is all just a stock Av. Thanks in advance Jim