Sorry for the very slow reply, yes I have a third function installed by the dealer. The valve is plumbed from the loader power beyond port and is located on the loader support pillar just below the loader valve. I unfortunately cannot tell you if it actually works properly since I have never used it. I am in the process of building a QA snow plow and will hopefully in the next week or so be hooking up the hydraulic cylinders, at that point I may know more. The dealer and service tech made no reference as to ever having and issue with any they had installed, but said they have installed many.