Originally Posted by BonneMeMN
SOunds like you have a short in the dash.... Dummy Lights shouldn't be on like that.
I'm suspecting something funky with the aftermarket installation. Something hot is running in series with the dash lighting, and with enough bulbs powered in parallel like that, they'll manage only a dim glow. If it'* a slow drain, it could have been days if not weeks before a fresh battery started showing major problems.
I'm going to guess here that possibly a ground for the sound system is not really grounded, and power from an always-hot supply to the stereo (e.g. for clock or tuner presets) is backfeeding from the sound system'* ground through all the other components that are supposed to share that ground connection. e.g. if there'* a switched power source as well, the current is backflowing through that circuit to seek ground.
I would start by doublechecking any aftermarket wiring connections. Ground wires from the aftermarket unit should be connected to actual sheet metal, not just any nearby wire that happens to be black colored.
You might try disconnecting the stereo for a day or so and see if that makes a difference.