My Dad submerged a ute in the farm dam when I was a kid. He left the door open when he got out to close a gate, and a tiger snake slithered in. Dad had just started moving again when he saw the snake on the passenger floor getting ready to strike. He jumped out leaving the ute in gear, and it proceeded into the dam.
Not much in the way of electronics in a '57 Holden ute, I don't think it took much harm.