I'm an officer with a small volunteer fire department. I'm not an electrical engineer. We have a rescue van that we roll on almost every call. We have a 12v light bar on the rear of the van. The light bar has a yellow rotating light at the rear center. When we are on scene, the yellow light is almost blinding. We would like to be able to turn off the yellow light when we arrive on scene. We would like to put a momentary switch some where near the rear door that will turn off the yellow center light. The catch is that we want the switch to self reset. At 4am after a long call, we don't want to add another item to our crew. When we bring the van back to the station we turn all the lights off. When the next call comes in and the van rolls, we want to be able to turn the rear lights on again from the master switch on the dash.
I've been sitting here trying come up with a diagram. My first thought is to use a switch to control a relay. But, I'm not sure how to get it to self-reset. I'm stumped. I'm open for any suggestion. Myself and the rest of our crew would be very grateful.