2017 Limited Sony system upgrade??

Ryan Minihan

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Jan 7, 2021
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Hey guys, I’ve got the 2017 Expedition Limited with the Sony sound system. I want to keep the factory head unit but add a aftermarket Amp and Sub. Has anybody attempted this yet? The only bypass wiring harness I can find is $350USD, when all I believe I need is a high level line converter. I just can’t figure out where to tap into to bypass the computer.
 
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