2010 prostar eagle

[a113n]

It might be your switch. I had same issue but on KW. After buying new switch it still didn't want to spray so I borrowed switch from my buddy that had same truck as me and it started to spray. Just because you buy new parts sometimes they are defected. Dealer didn't want to take my switch back since it was installed on the truck so I just went to auto zone bought on and off switch installed in on my dash and ran hot wire to the motor and when I needed to spray water on my windshield I just turned on the switch and it works. I have this setup for over 7 years now without any issue.