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You will not have stereo output, but you could easily go mono if you have an audio output. It probably will not be very loud though if you hard wire up the jack. Basically, you just splice into the drivers side speaker wires with head phone cord and plug it into the GPS. Then it will talk at the same time as the radio is playing. However your GPS isn't going to match the output of the radio (in watts), it's probably going to be pretty soft without an amp.
I guess you could go fancy and find a spot on the circuit board where the components are amplified and tap into it there, but that's more advanced than I would be comfortable trying on my only radio. Another idea is a remote speaker, they make them car phone setups and CB radios. Mount the external speaker where you like and plug it in to the 2.5mm jack on the GPS.
i don't know how you could stand having that voice come out of your speakers "make a legal U-Turn" drives me nuts every time, but i hate to ask sure you have the volume all the way up last two i have had got pretty loud...garmin and now a magellan
Has anyone hooked up a gps unit to the factory ford radio so the voice comes through the speakers.I have a hard time hearing the gps unit.
I have a Jensen NVX3000PC as my GPS. It's a Windows XP powered TabletPC with a 7" touchscreen with integrated GPS. The unit has an integrated FM Tuner so you can wirelessly listen to MP3/Video/GPS directions on your car stereo. Alternatively you can use the headphone jack and plug it into your aux input mini stereo jack (as you can with any decent GPS) Fantastic little unit. Recommended to anyone looking for a GPS.
You might be able to trip the mute used for phone integration. I don't remember how it worked, but I thought there was a pin that you ground to mute the radio. you would have to run a relay in parallel with the speaker, to put the ground on that pin.
Using an FM modulator, you would have to keep the radio tuned to the frequency and nothing else. Unless you found one that transmitted on all FM freqs and listened to the radio while using the GPS.
The 99-04 (pre-CAN) has the main plug and a changer plug. Only some of the 2002 and most all of the 03-4 can use an external changer. I am not so sure on the CAN radios, but it's most likely the same.