Welcome Brother!
Likely, the cause of the horn not working is the fact that most PPV/SSV's are ordered from the factory with OEM modifications that allow for hooking up certain after-market emergency vehicle functions. As in your case, I would bet $ the cause is an unplugged OEM horn-ring...
You may try looking under the center of the dash for two matching gray OEM plugs. If they match, but are unplugged, it is because the agency used the front door speakers to replay their car radio. Plug them back together and close the speaker loop.
Hello from OK! I am a Certified Emergency Vehicle Technician and former owner of an upfitter company. I will give this my best shot:
1. The USB input in the hidden compartment should connect a device to the radio. Make sure it isn’t unplugged from the back side.
2. Sometimes when a PD car is...
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