[MrE]

Another consideration is the insulation material. My Ford truck came from the factory with insulation that became brittle in cold temperatures. I was able to fix the driver door harness with silicone insulated wire.

"Silicone wire is a good choice for copper wire insulation because it is flexible and heat resistant. It can withstand temperatures from -90 to +300 °C. Silicone is also flame resistant, which is important for protecting circuit integrity in case of a fire."