From what I (Nils) can remember, the light bar came from some decommissioned fire marshal car. I don't remember who it was that brought it in or was working on it.
This thing uses all 12-volt logic, which makes sense since it would've been powered off a 12 volt battery.
It is made by "Jetsonic". Here is the manual: Media:Lightbar.pdf.
The guy that was working on it successfully activated some of the lights and the motor to turn the lights by poking at connections internal to the light bar.