I have a 2005 F150. When turning on the 4 wheel no lights come on at all. When you start the truck the lights come on. I have checked to see if the vacuum line works, which it does. ive also changed the solenoid. Still nothing. What is my next step?

 

Instead of me copying and pasting someone else's troubleshooting, take a look at this link on here:

https://www.f150online.com/forums/ot...5-f-150-a.html

Has some great takeaways...

Good luck!

 

Also:

https://www.f150online.com/forums/ar...then-some.html