BeaconMedaes MEGA 2 Installation, Operation And Maintenance Instructions page 44

Testing
Orange (+5)
Black (gnd)
Red (+24)
Figure 26: Power Supply Output Testing
Fuse
Holder
Line (black)
Neutral (white)
Power Supply Assembly
Figure 27: Power Supply AC Input Testing
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Part No. 6-847684-00 Rev. D01
Three-wire harness
from power supply
Annunciator Module