First, here is some info on one that a member had.
I have had my eye on this one for a few years. It was on a local Rescue unit. I was driving by the FD the other day, when I saw the chassis with the box dismounted out front with a FOR SALE sign on it. I notice the Box had been remounted on a new chassis, but also noted that the new truck had...
elightbars.org
Here is some 2001/2002 catalog info
These bars were pre-freedom and used 5mm 700 series LEDs in a firemaster edge frame. They often had a halogen piercealert in the center.
As far as wiring them, they were all different. Some had a black ground for the main lights and a white with black stripe or black with white stripe ground for the center option. Some had one ground. Everything that is not a ground turns on a pair or two of LEDs. If you can post a harness pic i can decode it for you pretty fast.
DCFD used these (no center option), here are some videos