Larry, the light in the panel under the driver's window is a Prevost light and is not assiciated with the bay lights. The same is true of the engine bay lights; they are Prevost lights. As Jim stated there are 2 switches that will switch the bay lights. If either is green when the panel lights are on the bay lights are switched on. Each light has its own switch on the light fixture. These should be left on. The bay lights, like most everything else, is controlled through the ECC--that large electrical panel in bay 1. The two switches go to one of the controller boards in the ECC that then applies power to the bay lights.

Do you have the electrical diagrams for the ECC? If not, I'll look up which board controls the lights.