You get the new one and start on one end by unplugging a connector and transferring the plug to the new harness. If you have to pass it through small openings where there isn't room for the old one and the new one, you can use tape next to each plug and write a description of what it connects to or you can draw a picture of each plug with a few wire colors and locations for reference, and write those on a piece of paper.
Replacing a harness is severe overkill for a short. The only time I ever replaced one was when the old one was badly damaged in a crash. If your troubleshooting points to a problem with a wire in a harness, look for a damaged area, especially where it's rubbing on a sharp edge of a metal bracket or on the body, or where it passes close to hot exhaust parts.
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Thursday, August 1st, 2013 AT 9:51 PM