I have a base model (LS) Silverado and I suspected that the wiring harness supports the turn signals for the side mirrors - suspicions confirmed. My old mirrors were power and defrost but no signal. I installed these mirrors with no problems and now I have power, deicing and turn signals. Great addition at a great price. A stock OEM mirror costs almost as much as this pair, but it's worth spending a little more and getting more features.
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