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I'm not positive but I believe the reason is because this system uses several different T-harnesses to connect to the vehicle in which it is installed. The only one they have for Ford/Lincoln products is the THFON2 harness which is only compatible with F-150 from 2015-2016. You should ask to speak directly to the Best Buy Tech that does the installation as he will be more familiar with what he can do, than the guy in the store. I know you can always go to an automotive stereo/alarm store that does their own installation and find one that will work for your 1999 F-150.
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