I am having some trouble with a Whelen Alpha SL siren I recently installed in an F250. When I activate the tone, I just get a constant popping sound coming from the 100w speaker. If I attempt to toggle the tones with the push button on the siren amplifier, I get silence. If I apply power to the switch again, the popping sound continues. I am at a loss here. I have checked the ground and the wiring diagram. The siren control is wired to the ford upfitter switch and I have tried two different 100w speakers with the same result. Any suggestions?
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