The standard set up "in the day":
first stop on the head light switch, Parking lights. turned on the white grill lights and the tail lights. This was used when the truck was "parked" on the side of the road, no 4 way flashers then.
Second stop, headlights and tail lights on grill lights off.
Directional lights were added by the owner, didn't become standard until the '50's.
