Thread: Second plug on factory unit?
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Old 08-26-2006, 10:50 PM
shtrdave shtrdave is offline
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Join Date: Nov 2004
Location: Southwest PA
Vehicle: 2005 Ford F150
Posts: 353
The plug i was refering to was plugged into the factory unit, but now it just hangs there unused. Apparently it is needed for an aftermarket HU. Still don't know what it does or did.
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