My truck was converted to 12v some time ago by a previous owner, and has a 60's GM steering column. The turn signals, brake lights and tail lights have always work fine.
I'm rewiring the truck now with an aftermarket harness. When I pulled apart one of my tailights to hook up the new wires, I noticed there are two bulbs, each with one element. So my first question is, how then do the lights work? How is it that there are only two bulbs with one filament each, yet I have tail lights, brake lights and turn signals? It just doesn't seem to make sense to me. I guess the truck didn't come from the factory with turn signals, but I'm just not sure how the previous owner made this work with only two bulbs. What bulb does what?
Secondly, my new harness has wires for the tailights and turn signals, but not for the brake lights. How does that work, does it just run off of the tailights?
And thridly, of the two bulbs that are in a stock 1940 tailight housing, which one is which?
Thanks!
