Was thinking of some sort of interior cab light when I ran across this gadget found over at Lowes. It's made by Slyvania (in China of course), has 3 led lights, runs on 3 AAA batteries (supplied) the bar rotates 90 degrees, turns on and off by 2 contact probes sticking out of the bar (just touch it), sticks on with velcro and the best part is it's around 10 bucks. Haven't tried it in the dark yet, but I'm sure it puts out enough light to find the ignition or take care of what ever needs attention. Just thought I'd throw this out here….
Mounted on the roof.
Light off
Light on
Mounted on the roof.
Light off
Light on