Underdash Harness bunt up

whatever fix for the burnt wiring you choose, the biggest challenge is figuring out what made it all burn up in the first place or it will just burn up again. Do you have non-stock electric equipment in the car - big stereo, high load headlights, etc? What is the amp rating on your alternator? Lots of new ones are over 100 amps. The stock wiring was made for stock loads. You can get around all this for those features, you just need to plan for them.