Double Light Switch Wiring Diagram - Auto Electrical Wiring Diagram double light switch wiring diagramLighting Switch Wiring Diagram - This article may contain indiscriminate, excessive, or irrelevant examples. Please improve the article by adding more descriptive text and removing less pertinent examples.See Wikipedia's guide to writing better articles for further suggestions. (July 2012). Lighting. The ashpan contains flickering LEDs done the same way as in the Shay. The firebox door opens to reveal more flickering lights. Like the Shay, I had problems with reliable operation of the flicker circuit and I applied the same fixes..