GenTek autodimming rearview mirror

I am trying to install a GenTek autodimming rearview mirror into my 2007 Ranger FX4. I am having terrible problems finding the correct wire to use for power. I have looked online and in the Haynes manual at wiring diagrams, but still cannot seem to locate the right wire. Can anyone tell me what color wire I need to tap and where to find it? Thank you!
 
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