Reply to "Altas F-3 interior cab light"

Well, since it has smoke, that uses up the typical control used for the cab light.  I made myself a module to do automatic cab light control among other things.  I also use this module to add Rule-17 lighting.

Here's what's "in the box" so to speak, this is the circuit I use.

Here's a typical application for a diesel, this gives you automatic cab light control, Rule-17 lighting, and smoke intensity control, lower smoke intensity when stopped.