I have seen 100% them that light up bothNot unless someone modified them to do so...
The '07-'14 Tahoes, Suburbans have independent turn signals... like yours.
The Avalanche and Silverado use both the upper and lower for brakes and signals.
I always thought it was strange that the Avalanche uses the Silverado style harness for the tail lights since it has essentially the same wheelbase as the SUVs.
top and bottom
i doubt all these people did the mod. might be by state thing .. so there is redundancy in place.
you can only see the side markers on the bottom
GM must have listened to their customers. since People here hate getting pulled over for burned out tail lamps etc..
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