I heard that in order to use the siren in the Motorola you need to also hook it up to the radio. Is this true? If it is, is there any way to use the siren without the radio or no? Also a wiring diagram would be nice, thanks.
This is true. I have a new siren amp with DEK and its just a brick because I don't have a radio for it.
My understanding is that even with the radio, if the radio is not set up to "allow" the user to use the add on siren amp, it won't work. Due to that I have been hesitant to source a radio for mine when it really is just for shiggles.