Loosen the lugs slightly on the front passenger side of the car. raise the front passenger side of the car and remove the wheel. At the back of the wheel well are two pieces of plastic shrouding. They are held by one or two plastic pins. Using a screwdriver, pry out the center of the plastic pin, it should come all the way out. Then you can pry the outer sheath of the pin out of it's hole. The plastic shrouding can now be pulled out. Don't worry, there is not much to be damaged at this point. Now, make sure your car is stable. Scissor jacks do not mean stable. I admit I did it with a scissor jack, but I would recommend a good jack and a jack stand because you are gonna spend a bit of time under the brake rotor and if the car falls, you're most likely dead. Once the shrouding is removed you should be able to look up in there and see the alternator and the tensioner pulley. If you are confused as to which is which, there should be a diagram at the front of the engine compartment in front of the radiator that shows all of the pulleys and the routing of the serpentine belt. Now you need to remove the serpentine belt. Get a 14mm box end wrench and put it over the bolt on the tensioner pulley, the small pulley without tracks that is Slightly closer to the front of the car than the alternator. Tighten this bolt. This may seem counterintuitive if you have never done this before. But trust me. Rotate the bolt clockwise. This will release tension on the serpentine belt so you can pull the belt off of the alternator. After removing the belt, find two 13mm wrenches or ratchet attachments and remove the nut and bolt that hold the bottom of the alternator. Then remove the bolt at the top of the alternator. 13 or 14mm, I can't remember. Make sure you get the right one, it is just to the left of another more visible bolt that fastens the accessory above the alternator (can't remember what it is). After that bolt is removed you should be able to get back under the car and slide the alternator out of it's holding position. Now disconnect the alternator wires. This can be kinda trick as they are difficult to reach, and the main plug has a plastic latch holding it in place. Use an 8mm on the bolt holding the other wire. Now slide the alternator out through the wheel well. You may have to rotate it a bit to get it to come out of that hole. You're done. Go have kragen or some auto shop test it to make sure it's bad, and when you buy a new one, make them test that one too. It will save you so much time trying to figure out why your car is still not working right. Reverse the procedure to put the new one back in.
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very carefully
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Take it to a certified mechanic and pay him $300.