I changed my manual mirrors to power/heated paddle mirrors (don't like the elephant ear style

but wanted to do away with the scraping frost/readjust mirror drill in the AM).
Anyway, I had to run wires for the power and for the heat. It can be done. Check the heated mirror link in my signature.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version

), AIS,
coolant filter w/"hokum" bracket, regulated return,
heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check Here