Rodents chew on harnesses, it's what they do. But making the insulation from a food source is ridiculous.
A friend has a 1970 Challenger and critters chewed the harness- so much for being original....
Had it happen twice to my F150. First time at the home at the beach. I went out to go to town, turned the truck on and the dash lit up, Things like high decent, 4 w drive light ( my trucks not equip with either) but the seat belt warning light and the air bag warning light came on., Had no clue what happened. The truck did crank, so called the dealer and they had me check a few things and noted, if it drives bring it in and we will have you a loaner. Got down there, they pulled my truck into service and after 2 hrs, the service advisor came out and said come with me. IT looks like you have some new friends. Well the mice had somehow gotten into the cab and chewed through the wire in the door jam and killed the electronics under the center console, which is where the warning lights/circuity module is housed. They said pick it up tomorrow so we can look for how the mice got into the cab. Came back the next morning, the truck was ready and they found that I had had a service 4 months ago for a warranty AC evaporator which is under the dash/ firewall area.. The service tech appeared to not have secured the rubber grommets into the firewall good enough. A mice entry point. Charge ZERO $.
2nd time at the house in Hilton Head. marsh rats got under the hood and ate a few of my sensor wires, including some injector wiring. Took them 3 days to get it sorted out and fixed. Insurance picked up the tab of $1350.00, plus my rental car back to Fla. I paid my deductible of $135.00.
The insurance company noted this is a reoccurring thing al over the US. She noted you should see the repair bill on a $800k combine. The new wires are made out of something the rats, mice find rather tasty.