Unitrol Omega 90 +12 or gnd for trigger


Lurking Newbie
Original poster
Sep 5, 2012
Los Angeles CA
I have a Federal Signal Unitrol Omega 90 Amp and using it with a FS MC100 Speaker. Works great. I only want to use the airhorn and am using the BROWN wire for the air horn control. I have noticed that either +12VDC or GROUND will trigger the airhorn. Which should I be using or does it matter? It will be used on my motor home. AIR HORN ONLY. Thanks in advance

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