I'm wandering if again Best buy is at it again with their scams. I'm wanting to put in this after market stereo but was told by a lil zit faced kid at best buy that my truck will shut down without the 130 dollar wiring harness. Does it really effect it as much as they say or is it another scam to get me to spend more? I have onstar but do not use it. I don't have Bose speakers either. Can I get away buying the cheaper harness on Ebay? Hate to spend a fortune on wires for a radio!!! Thanks so much!! Any help will be greatly appreciated!! God Bless!!