Originally Posted by truckernix
Did the electric wipers appear earlier on the car?
According to the 1929-1957 Master Parts Catalog MPC.
Chevrolet passenger car electric wipers did not appear until 1955.
Group number 10.150 Motor and Parts Windshield Wiper

Chevrolet Truck electric wipers did not appear until 1954. Regular Production Option RPO 320
Group number 16.064 Motor-Housing-Screw-Switch-Windshield Wiper

I guess you could say a Chevrolet Truck electric wiper motor was offered 1 year before the Chevrolet Passenger car.
One-up for the Chevrolet Truck Engineering Department!

1954 Chevrolet 3105 Deluxe Panel Truck
w/Factory HYDRA-MATIC