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Mod | | | Forums66 Topics128,087 Posts1,055,980 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2006 Posts: 173 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 173 | I am puzzled by the wiper knobs in my 46. What do the two knobs do? I don't have any arms on them right now, and they no doubt need rebuilding, but what knob does what.
Sorry for the duhhh question, but I don't have an owners manual for the truck.
Scott
1947, 1950, & 1952 Chevrolet 1/2 ton
1952 GMC 450 series Cab Over Engine
1946 Chevrolet 2 Ton
| | | | | Joined: Apr 2009 Posts: 252 Shop Shark | | Shop Shark Joined: Apr 2009 Posts: 252 | Not sure I put electric motors in. Maybe one opens for vacuum and the other for speed? | | | | | Joined: Nov 2006 Posts: 173 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 173 | Gman, that was my thought too. I just wonder what those two knobs do.
Scott
1947, 1950, & 1952 Chevrolet 1/2 ton
1952 GMC 450 series Cab Over Engine
1946 Chevrolet 2 Ton
| | | | | Joined: Jan 1970 Posts: 365 Shop Shark | | Shop Shark Joined: Jan 1970 Posts: 365 | One knob (the left one, I think) makes the wiper operate. The right knob 'parks' the wiper. | | | | | Joined: Nov 2006 Posts: 173 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 173 | Thanks racecarl, I thought the right knob acted like a valve of some kind, it tightens up to stop. By "parks" do you mean the left adjusts the sweep of the arm or effects where the arm stops when you cut off the vacuum.
1947, 1950, & 1952 Chevrolet 1/2 ton
1952 GMC 450 series Cab Over Engine
1946 Chevrolet 2 Ton
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