speedway uses the same color code as gm standard color codes i believe. also the same as most aftermarket harnesses
there should be 2 connections on the stop light switch: orange power in and white out to the turn signal switch
you have 7 wires going to the turn signal switch: 3 hots in - blinker, hazard blinker and brake light switch, then 4 wires out to each corner of your truck
your brake lights and turn indicators are the same wire out back, plus you have a wire to the back lights off the headlight switch
in the harness there should be a single tail light wire that splits into 2 wires for tail lights and 2 wires LR and RR stop/turn, it may be only written as LR and RR turn
there is a double filament bulb in each tail light; the big bright one is stop/turn and the smaller dimmer one is tail light
what column are you using?
