I bought an 04 DC Tundra with an amp and sub already installed. When I bought it, I thought everything was hooked up correctly and working. Just found out the positive 12 volt to the amp wasn't actually hooked up. When I did connect it correctly, my stereo and dash lit up. This is with the keys out of the ignition, so obviously something was done incorrectly.

First off, has anyone seen something like this? and more important, can someone steer me in the right direction of how it should be hooked up correctly?

JBL HU w/ 6 disc changer
2 8" subs in stealth enclosure under the rear seat
not sure if the speakers are aftermarket or not

If you need any other info, let me know and I'll find out as quickly as possible.
Thanks for your guys' help.

So, now I am thoroughly confused. Just went back out to the truck, tried to re-hookup the 12 volt to the amp, and it works fine... 15 minutes ago, I had nothing different and I had the above issue. And yes, the keys were in my pocket the whole time, so I didn't accidentally leave them in the ignition.

Looks like I've got it fixed for now.