Here's how you can add a second USB port to SYNC-equipped F150 trucks. The
great thing is that SYNC includes a second USB port but it's on the main SYNC
module, so what you need to do is plug in a USB extension cable from that module
and run the cable to wherever you need. Thanks to member pikappkaz for the photos
and most of the write-up.
First off you'll need to buy a USB extension cable. One end should be a mini-USB
end that plugs into the SYNC module. The other end can be whatever works for
you, likely that will be a female USB end.
To access the module, go under the tray on top on the dash, pull up the rubber
liner, remove the two 7mm bolts on the plastic tray, and you'll see the module.
Here is a photo of what you should see:

Next, plug in a mini-USB wire to the grey port, Sync references it as USB2.
Here is a photo of it connected, with the other end of the cable shown for reference:

I dropped the wire down into the right side of the hole, and grabbed it from
the unlatched glovebox. The wire easily rests in the glovebox for access. Here's
a shot of my installation:

Test it out and if it works great, put the top of the dash back together. I
tested it out and it works great, I hooked up a 16 GB USB thumb drive (I needed
a female to female adapter) filled with music. It detected a new device on USB2
and proceeded to index it. I pressed the voice button and said USB2, and there
it was.
The BIG advantage to this is security. I don't take my iPod / MP3 player out
of the truck ever, and I can now hide it either in the glovebox, or tucked up
behind the glovebox. Good luck!

Other SYNC discussions in the F150 forums
Keywords: ford f150 sync second usb port cable module easy diy
2010-01-06 at 7:14pm
Didn't work on 2010 F-150 Platinum
2010-04-15 at 7:45am
worked like a charm
2010-04-23 at 12:57pm
Dash tray?
2010-08-17 at 12:56pm
How to add a second USB connection
2010-09-25 at 2:27pm
1 terabyte HD loaded with music
2011-04-16 at 4:50am
Usb2
2011-08-04 at 12:48pm
2011-08-04 at 12:51pm
USB-2
2011-09-22 at 7:17pm
This worked like a champ!