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Stumbled across this video showing the light switchoperation and what it does to the lights on the truck.

See the post just above yours

And he can find TM 9-8030 in the technical manuals section. HEre is a page with links to some manuals for the M37: https://www.steelsoldiers.com/threads/tms-for-the-m37.83365/

Yes, the ignition switch sends power to the ignition. Unlike a modern car, however, it does not have a "start" position. You use the foot pedal for that.

All these switches do is control the lights, nothing else. The starter is operated by a foot pedal. Yes, the lower right lever is just a lock to keep the upper lever from accidentally being bumped and turning on the lights. (You can imagine that if they were running at night with the lights...

This PDF file should help. As you may already have discovered, you can't turn the upper lever on unless you are holding the lower right lever in the unlock position. (You can turn the lights back off without holding the lock lever.)