Elec. Wiper Motor 6V.

coffeedart67 said
The secret .......... to the vacuum wipers was to step on the gas then let off and the wipers wild go like crazy for a second or two.

LOL. This doesn't do ya much good if you're climbing a long hill or have a loaded truck, trailer. Add ice and snow, and you have a lot of fun.

My Dad, Gramps, when I was a kid, had more than a couple old Chev/ GMC pickups with vacuum wipers.