i was in the same boat but i went with the http://www.crutchfield.com/p_130P3400BH/Pioneer-AVH-P3400BH.html?tp=20217#accessories-tab since i will be using the motion x as my gps i couldnt justify the cost of upgrading the unit with nav. i order the relay for this so i can us going down the road...
i do beleive it is the wire to charge the battery in a rv and you have to hook it up to the fuse under the hood.
here is what i used when i hooked up my brake controller and that wire came into play
http://www.eworldz.com/truck/gmt900.pdf
yes it seem like they should be cheaper out there if i get time i need to call around some of the dallas auto yards to see what they have but the only issue is that i dont speak spanish and sometime it is hard to relay what i want.
i was having the same issue but i used this and it really cleared things up for me. even bought some for the wifes van...
http://www.lucasoil.com/products/display_products.sd?iid=269&catid=8&loc=show&headTitle=%20-%20Lucas%20Oil%20Deep%20Clean%20Fuel%20System%20Cleaner
where did you end up tapping in. i am looking to tap in that is not always 12volt i want it switched.. i have mine plug in the cig. plug but that is always on..
thanks
maisano
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