There are two wires going to the column for power, one from the brake light switch and one from the signal blinker.
Under normal conditions (no turn) the connection of the brake light power is connected to both rear turn lights.
When you turn on the turn indicator you disengage the brake power from that side and connect the blinker power to both the turn lights on that side.
it seems like I don't have no power up there anywhere except for like I was saying that horn. Also I haven't got into the actual wires I'm just tested up at the top. But that's interesting that I have brakes and now no signal so here we go...
