Looking for a useable in cab park lamp source 09-14
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Figured it out
Ok so what I figured out with work on 2013 and 2014 WITH OEM powerscope mirrors. I traced the signal back from the door connector on the a pillar. It comes from the floor harness that runs up behind the parking brake bracket. There is about an 18ga yellow wire with blue tracer. It is part of the 15a front park lamp circuit. I spliced into that an all is good. As for other trucks w/o powerscope, you may not have this as the wire won't be there for the mirror.