I had a couple of shops in Hemet, CA for a while and that there WERE a lot of citrus farms in the area, there were rats all over the place and they chose to live in the top of the palm trees many times.
I had a few --- mark that: a FEW customers with rodents (read: really huge RATS) that merrily chewed up their wires.
Mostly it was Fords and Jeeps, but an occasional Cadillac of current vintage only (this was 1994-1997 or so) vehicles we chewed upon.
But, since that particular experience, I haven't seen it so much any more.
PROLOGUE: Although I'm retired - I still get a few "customers" who know I was a SoCal mechanic and they seem to eschew the local farmer's kids working at the dealerships and shop, so I get a lot of word-of-mouth work.
So - I work on a lot of vintage stuff --- and not just JD and Case tractors - but honest-to-real cars and trucks. But I think the occurrences of wire eating rodents has either stopped or all the rats moved to warmer climates.
PS - I live in Montana - and we get --- maybe ---- 4 weeks of summer. My guess is that all the rats are now in Phoenix or Riverside.
.