It was driving me nuts that I had to find a flashlight before I could find a switch on the main panel.
(An oversight that GD should remedy)
I found a battery powered LED cabinet light (Home Depot . . . two for $5)
I put the light on the door and the magnet (small white cube in the picture) beside the panel.
Backwards from how this would normally be configured. The magnet turns the light off when the door is closed. Now, I can see the switches !
(BTW, these lights are going to end up in lots of the dark cupboards on our RV)
Click image for larger version. 

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