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LM7

Josh

By Josh

    • Engine, Vortec 5300 SFI
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LM7
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Arctic28!

I have a 05 silverado 5.3 LS EXT cab. I can't seem to get a wiring pinout for the underdash to the fuse box. It was a mess under there so I pulled it and have a 04 Sierra harness x2 a 03 and a 04 crewcab I have the 03 and beyond manual (315 page) but can't seem to match up my pinout to my truck. I would be happy with a factory default if I could get the whole thing from C4 to the passenger side pinout. Don't need the PTO, diesel or hybrid just gas! Any suggestions

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