Having trouble figuring out the lights on my '37 1/2 ton. PO added tail lights and turn signals front and rear. My understanding is that it originally
only had one tail light that included a brake light but no turn signals. So when I pull the light switch to the first position everything works as it
should and head lights are on. When I pull switch to 2nd position, the head lights stay on but tail lights go out. Turn signals still work in that position.
The brake light wire only goes to the original one taillight. I'm wondering what the purpose was for the two position switch since the truck originally
did not have parking lights.