Question about Federal Signal electronic siren wiring harnesses

[Night Patrolman]

I'm curious: Did the wiring harnesses for Federal Signal's electronic sirens ever change between the PA-15/PA-20, PA-15A/PA-20A Series A-D and the PA-15A/PA-20A Series E? Just thought I'd ask because I plan on buying my first FS electronic siren pretty soon and I want to be sure I can get it going with minimal hassle.

 

[Wailer]

I've got a pin and socket harness for power and speaker connections and it works for all my variations of the Interceptor: PA20, PA20A series 2C and 2D, and PA20A series 2E.

The PA15 and PA15A have wires for power connection and screw terminals for speaker and radio connection.