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Your half way there. All you need is a wiring diagram to trace the wire from the ignition to that fuse. Most likely it is one wire from the ignition, then it splices to the different fuses. In my experience the splice fails(corrosion), Some times you loose one area, some times all. Depends on which side of the splice is corroded the most. Splices are hard to find. Even harness diagrams can be as much as 2 feet off. I usually find the color code of the wire and run a new wire. In your case, it would be from the ignition switch to the fuse panel.
There may not be a wire in the dash, the connection depends on the shift lever's possition and usually a switch near the shift lever that turns the reverse lights on. If there is actually a reverse light on the dash, look for the wires to and from that light.
The reverse light wire will not be under the dash, there will be a constant live feed from the fuse to the reverse light switch on the gearbox, that is no good for you. You need to take a power after the switch, that's live when reverse is selected. You may be able to pick this wire up from the loom, loom runs down the left hand side of the vehicle. Look at the wire colour to the reverse light at the rear and trace in the loom. at the front kick panel
Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. With the tow package, there should be a plug under the dash... far left above the emerg. brake petal. The harness that plugs into it should have came with the truck, or you can order one to fit it. Did thew truck come with a 7 pin plug on the back? If not you can order one from the above mentioned site. They also have the wiring colors.
Forget it...go to a car stereo installation shop and buy a wiring harness for your car ($20-40) and you're done! Good Luck P.S. might as well buy a dash kit ($30) to make installing the radio simpler as well...if you DON'T have a car stereo shop nearby, order parts from crutchfield.com
You need to ground the negative from you mirror to a bolt or screw in the car. Then find out which is the positive in the turn signal for each side. You can do so with a test light, turn the signal on then probe the wires at the harness until the test light blinks. That's the cable, attach a cable to the signal cable how ever you choose just don't cut off the signal cable. Then run a cable to the mirror on that side. Do the same for the other side, the easiest way is to hook them up to your turn signals.