My truck came without the delay wiper function. I've since had to replace the turn signal switch and replaced it with the cruise/delay wiper option arm. So, help me out here, what additional part(s) do I need to get the delay function working? Replace/upgrade the motor? Is the delay function in the wiper motor or located under the dash somewhere? What is the part called? What year will work? Many thanks! I don't know the secret to success but the key to failure is trying to please everyone!