These lights have been altered to accept "cruise light" sockets and bulbs inside the top of the domes.
The original factory raised lens cage mounting plate has been replaced with a flat sheet metal mounting plate, alowing the lens cage to sit lower under the dome, making room for a replacement bulb socket assembly with a cruise light bulb sticking out towards the top of the dome.
Pictured here are 2 or 3 slightly different versions of this bulb socket assembly change,( pictures 4 and 5 are different from the first 3 ), so I am not sure if the cruise light add on was done by Whelen as a special modification for Hawaii, or if the modifications were done by the departments themselves. Because the alterations are not uniform, I tend toward the latter.
All of the Hawaii version ROTA-BEAM MODEL 22,44, or 55 lights, that I have seen, used either the older, or the newer version of Whelen's Quick Disconnect mounting system. See the post, in this thread, titled ROTA-BEAM Mounting Options, for pictures of these quick disconnect mounting systems. The problem with the cruise light, and the quick disconnect (QD) mount is that the QD nipples had only one pole, and grounded through the body of the nipple. This does not leave an electrical connection for the cruise light to operate seperately from the rotator, and on the above lights.
I found some pics of a QD nipple , from another member, that has a QD nipple and plate that has 2 poles. This QD mount would allow seperate control of the rotator and the cruise light.
