i have a 99 f150 4.2 v6 5speed tranny 4x4,when i manual shift it into 4x4 there is no clicking nose from the solenoid and also my low light is on not the 4x4 light.umm i pulled off the vaccum lines to the actuator one line always has vacuum and the other one did nothing.also when i lock it into 4x4 the front drive shaft locks up but does not spin the front wheels,any idea guys.btw the actuator does not move at all when i lock it into place.