switch with 2 outputs?

heres what im trying to achive
im doing a light and siren package on a car(before i get yelled out we have the authorization from the city)

i want to addd the horn cycle function on the siren which uses the horn to change siren tones
usually i just disconect the factory horn and and be done with it...
but this is going to be dual purpose
so i want to have the hron function normally then when the lights are activated have that + output activate a relay switching from the neg pulse on horn to a neg pulse to the siren itself. without honking the factory horn
thanks

Hi.

I see two possible solutions on this.

Solution 1 - use multiple poles relay
Relays (or contactors) with multiple sets of contacts can be used to make a bounch of flipflops (need two relays for that) that can be configured to shift between multiple states.

Solution 2 - Use one contactor and control circuit (or about any microcontroller)