While most major auto manufacturers now include auxiliary ports as easily accessible options for drivers, that wasn't always the case. Back in 2005, aux was relatively new technology in cars, so Ford didn't make it nearly as user-friendly on the 2005 Focus as in recent model years. The vehicle, while equipped with a port, requires the removal of the head unit to access. You'll find the port on the rear of the CD changer, which You'll need an RCA => 3.5mm converter to use. If You run a wire from there to a part of Your cab, You'll be able to plug in all types of Audio accessories (that are auxiliary compatible) and stream directly to Your Focus's speaker system.
On the 2005 ford focus, the aux plugs into the cd changer port in the back of the head unit and you just need an rca to 3.5 Mm cable.
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