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Welcome back for Part Two of the story. If you missed the first part, you'll find it here.
You may find a socket that has a connection for a ground wire. If you do, make sure you connect a ground wire to it. If there is already one in the right location make sure you double check to ensure there is no corrosion on the body connection before you move on.
Do not be surprised if getting to where you can push the new harness out into the passenger compartment from the trunk requires you become one with your car. Mike just climbed in, made himself as comfortable as possible and got the job done.