Wiring Harness – new or used?

Would you get a new wiring harness (if possible) or a pull a used harness from pick & pull or pick only the portion of the wiring harness from pick and pull?

The rats have now twice eaten the green wire going to the multi-plug at the top driver side firewall box. I tried splicing a jumper, but it still fails. So I'm thinking its time to look further.