Federal Signal Federal Signal Beacon Ray 174 Wiring Diagram

I don't remember if the 174 has the R and W connections like the 175 does. These ground to frame, and that is done by the bulb cage connecting to the drive shaft. + hot comes from the brushes on the bottom of the bulb cage that make contact with a copper plate that is seperated from grounding out.
 
My 174 has a single positive terminal as do the images I have of other 174's. I would not say that all 174's have a single terminal as Federal Signal would custom build their lights for special orders, but I think it is safe to say that the majority of 174's would have had a single terminal.
 
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100% correct (even showing how I ground to the gear box cover). What you have labeled “4. Connection to light bulbs” is how the power is transmitted to the bulbs. Inside the bulb cage is a solid wire rod inside an insulated tube (like a hard cardboard) that terminates at the top of the bulb cage with a nut and insulated washer where the bulbs power wires attach.

FYI, the dark “circle” to the left of “4.” Is the oscillator shaft…a quick way to quickly ID a 174 (they may not be dark like mine, a 1958 vintage).

Here’s the link to my post with video:
Thread '174 Gear Works'
https://elightbars.org/forums/threads/174-gear-works.90888/
 
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