You need a continuous duty solenoid, such as the Cole Hersee #24213 or a 24059, and then run a #4 gauge wire from the positive terminal of the battery to the solenoid and then another 4 gauge cable from the other side of the solenoid, to the siren. The next thing is you need to find the siren / horn switch, and on that switch, there should be a wire that isn't connected to anything. You then add additional wire to that wire, and connect it to one of the small terminals on the solenoid. The other small terminal of the solenoid, has a wire going from it to the ground. This can change, depending on how your car was wired from Superior. Sometimes, the wire from the horn/siren switch is the ground, which would mean that you would put 12 volts to one of the small terminals, and the other would be a ground wire coming from the horn. I have seen them done both ways. No matter what, you need to have someone that understands automotive electrical wiring, and understands how to wire this safely. The last thing that you want to happen is for smoke in your ambulance. Possibly you could find someone in the town maintenance garage that will have the knowledge to do this. There is a diagram on the B & M Siren page, and it would be a good starting point for whomever you find to install this siren.