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Replacing it means to replace the whole harness. The contacts just need to be cleaned. Someone should make and market a tool for cleaning, like a battery post tool.
Not that big of a job....it just plugs into your tail light harness mounted to the frame above the rear axel..but like I said a small screw driver and fluid film works great.
Get some electrical contact cleaner, a small screwdriver and some toothpicks. Once you get it cleaned out it would be wise to use some dielectric grease and find a cap for the plug.