OK so ive been reading alot of the threads on here about 4x4 issues but nothing seems to be like mine, I have a 2000 F150. the vac lines were busted so i got new ones and installed them was still having problems so i started looking at all i knew, installed new transfer case motor, vac acculator motor, and new solenoids on the fire wall thinking a i coverd everything i tried my 4x4 it works everynow and then. when i turn the swtich i get a bunch of relays clicking but then nothing happens??? but sometimes i can turn it on and it clicks right on in soooo confusing can anyone help???????

 

4x4 fixed!!! turns out the wiring harness going from the vac solenoids had a break in one of the wires.