I will get a picture and post up a link to the solenoid if I get home before dark tonight. I like it because it uses a very low amp momentary switch that can be remotely located in series, so you can have as many as you want without huge wires running all over the place. The actual solenoid goes near battery. The traditional switches have always worried me because the bigger the wire the hotter it is when it grounds out... if it does.

I mounted momentary switch on the outside on drivers side since corner workers usually go to assist driver first thing and most likely will be in the drivers side if the car if they can be. The one in the inside of the car is on the center dash reachable by drive out corner worker that may reach in from passenger side in the event I am unconscious and the drivers side of the car is not reachable.

Stephen