Harness???

1969383S said

It is all custom so an appropriate
harness(s) will need to made and fabbed. I would recommend going to an electitrcal shop to have it built if you have limited experience. There is no plug and play option for you so to say. Aftermarket is the only way is only way to go and the factory service docs will only provide limited direction. You can buy some books and reference the factory docs but if you are not very comfy about it, leave it the experts.

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I will agree with 1969383S to a large extent. If you aren't comfortable with electrical systems, they are nothing to mess with. You didn't say why you were replacing the harnesses. Are they bad, or did you just want to accommodate the changes from stock under your hood. Try having a local electrical expert look at it and get a quote. He may be able to fix and rewire what you have for less than replacing the harnesses AND customizing for the changes.