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Picture of Direct wire GPS for 2005 Seinna with NAV
I really missed my direct wired GPS when I sold the older van.  So while I was doing the iPod GTA car kit, might as well do this one too..

What you'll need:

1 - car adaptor for your GPS
2 - some thin gage wires, 2 colors preferred
3 - electrical tape & cutters
4 - some zip ties

Step 1: Tapping into the lighter

Picture of Tapping into the lighter
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Please refer to my other instructable on opening the center console:
http://www.instructables.com/id/GTA-Car-Kids-for-2005-Seinna.

*** BE SURE car is in OFF position ***

Once you open up the bottom, note the color wiring of the lighter.

Disconnect & open the wiring terminals by pressing the locking plastic tab & pull. Then connect your wiring there.
I used double strand, just incase of overloading.