Interesting Steve. The original wiring on my coach had 1 tail light on each side, 1 turn signal on each side and 2 stop lights on each side. However, the tail lights and stop lights were both dual bulb lights that could have been wired up either way. There was one of the three wires taped off on each of the tail and brake lights.
When I replaced my tail/brake lights with LED units, I rewired the lights to have lower two lights on each side as tail lights and all three on when the brake lights are on.
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