I never connected the blue wire to anything, since I didn't know what to connect it to. Now that I know, I suspect I can connect it to the wire labeled power antenna. Since my truck's antenna doesn't go up and down, it's probably for signal boost. Come to think of it, since it was never connected originally, that might explain why I never really got great reception with the tuner module.

I'll check the fuses, but I'm fairly certain that they aren't the problem, since I'm seeing power getting to the sled (by taking the player out of the sled, and testing the pins on the docking connector).

Maybe posting pictures would help a diagnosis?