My 2003 supcrew fx4 will not engage in 4 wheel drive.All fuses check out.My guess is im not geting enough volts to engage the 4x4.The dummy lights in the dash for the 4x4 wont come on when i turn the switch.Every thing was fin untill i pulled a trailer this weekend whitch dosent make any sence.Any ideas ?

 

Hi
You might want to check this out if you have vacuum engaged 4x4.This is a common problem.Good luck,Pete

http://www.ford-trucks.com/forums/83...ml#post7322441