I'm replacing this wire:
The wire is a shielded twisted-pair with a drain (SAE J1939/11).
The wire seen here is the stock wire. It's comically unkempt. Note that the orange wire is about five inches too long, so that it must be doubled-back to make it the proper length. Also, the shielding is missing from the first six inches, and the last four inches. Neither of these is a problem from a functionality standpoint. I mean, it probably doesn't hurt anything. It's just sloppy. That loose twist of shielding provides no benefit, so why did they leave it loose like that?
This is what I made to replace it. All new wire and connectors.
It was hard to find a short length of J1939 wire. I found a few sources that were happy to sell me a 250ft spool, but I wasn't happy enough to buy it. I found a guy on ebay selling teflon/silver shielded twisted pair. $35 bought me 25ft. I wasn't trying to get silver. In fact, I wouldn't have bought it if I had realized that this is what it was. However, this is remarkable wire, so I'm going to give it a try. It's temperature rated to 200ºC. I don't know if it's oil rated.
