It depends if what's worth more to you-your time or your money. It's not THAT hard to pull the entire harness out of the car. Get the FSM, Check/repair one wire at a time. I recommend soldering repairs and shrink sleeve to insulate. Taping the wire branches is a good idea.

Plan on taking at least 8 hours for this venture, but you should have a good harness once you're done

While outside on the turnpike They got this new hit tune Where thrills become as cheap as gas And gas as cheap as thrills