I have a ford 2000 ford f250sd 5.4 my 4x4 will not engage.... it has the onfs with the manual auto hubs...have checked vacuum lines to hubs replaced checked fuses replaced just to be safe Manuel says there are relays but can not find them.......... do not hear relay click indicator light on cluster dose not light up will mot go into 4x4 with manual on hub...... now here is another question to consider.... if power is not getting to transfer case manual hub will not engage correct???? and even to they are manual on the hubs does the vacuum still need to be hooked up???? any help would be greatly appreciated i have been searching for weeks and read 100s of threads on this topic but yet have found my answer ty very much in advance

 

not sure if electrical /vacuum or mechanical problem

 

The first thing I'd recommend checking is the ESOF motor on the back of the Transfer Case. It's what shifts the TC in and out of 2 Hi, 4Hi and 4Lo. They have a nasty habit of checking out when you need them the most. I might also recommend a few light taps with a hammer on the side of it. This sometimes wakes them up.

 

i did try that this after noon after i put my plow on yea bad time for it to go out..... Nothing im not concerned about the 4hi 4 lo light not comming on even tho i now they work ( not blown bulb) they come on clust at start up of vehicle.... more concerned with not hearing relay click if relay don't click will not open connection to tc correct
??????? problem is dont know were the relays are....... ive been looking for a diagram that will help from switch to vacuum to sylonid to relay to transfer case kinda in laymans term i only know this far by reading....
ty

 

i guess what i wanna do is track the electrical side replace and fix then trace the vacuum side replace and fix......... i did jack up truck turned the dri shat by hand and front tires did trun im starting to believe some is not engaging the transfer case shift motor. but yet again don't know the electrical rout EX.... relays silinoids motors pump a diagram schematic or even pic with detail info from what i under stand the front wheels will not engage if transfer case dose not engage even if manual hubs are locked in is this correct?????? if so what rout dose the electric take to achive this taken vacuum out of equation for now..... as with out electric vacuum will not engage is this also correct????

 

Trying to figure out what your posts was getting at ?

You jacked up and shifted the transfer case into 4H and the front axle turns when it should be locked in ?

What fuses did you check, and how did you check them ?

 

no i turned the drishaft by hand did turn much but the tires moved a lil and all the fuses that coressponded with the 4wd i used a light tester then switched out fuses

 

what does this mean ?

The front drive shaft turned without stopping or would only turn an amount and stop ?
What does "tires moved a lil " mean ?
they were turning while the front drive shaft was turning ?

What fuses did you check ?
- As in the actual number and fuse panel location of the fuses.

How did you check them with the test light ?

 

ok what i did was took test light hook aligator clip to ground and touched metal tab on each fuse and i checked all fuse passanger compartment and engine as i do not have fuse diagram...... as for fron axel i jack up front of truck then trunend front drive shaft by hand to make sure nothing was brok in front end the tires did turn a lil bitfrom the play in drive shaft. im not a machanic and have usaly paid to have things fixed but ith econamy i wanna make that my last resort. this is the best i can anwser your queston as i do not know exactly as to what you are asking

 

also i do not hear system engage at all...... dose the vacume and electrical co inside what engages the front d/s to spin???? i know the 4x4 shift motor but what tells theat to engage vacume of electrical.... i wanna eliminate the vacume for now as i understand i can get truck in 4x4 with out the vacume engage ment i have no problem getting out of truck and maualy locking hubs

 

What was the outcome with this problem and what did you do to correct the problem?