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Most likely your accuator is bad, every door has a accuator which is the electrical part that makes the door lock operate,this is very common.go to a junk yard and get one for allot less money. To replace the accuator just take the inner door panel off, you will need some kind of a light for this but the accustor is on the left side on drivers side right side on passengers door, you will see the accuator which has a hook on the end of the unit,by the way the accuator will have a rubber sheathing covering the body,some fords have a small clip on the end of the hook on the accustor,remove the clip, unplug the accuator replace the new part.This is a good place to start.
MOST LIKELY THE ACCUATOR IS BAD / YOU CAN REMOVE IT AND HOOK IT UP AND CHECK TO SEE IF ITS WORKING PROPERLY DO THIS THE SAFE WAY ,MAKE SURE SOMEONE HELPS AND BLOCK THE WHEELS AND SET PARKING BRAKE SHOULD BE ABLE TO TEST WITH KOEO THAT MEANS KEY ON ,ENGINE OFF
do you know if your switch is good? i believe your truck uses vacuum preasure from the motor to activate the front axle accuator. your problem could be the switch, accuator, or vacuum leak. vacuum leaks for 4x4 are a pain to find and follow, i had the same prob with my jeep so i ran a vacuum hose from the accuator directly to the motor to make sure everything else was in working order. hope this helps.
Start by checking fuse #7 a 15amp fuse in the fuse block under the left side of the dash. This fuse is for the accuator motor on top of the left front axel tube. The accuator moter engages and
disengages the front axel for 4wd and 2wd. If the fuse is good, have someone operate the switch
and check to see if the accuator is working, you should be able to hear it engage or disengage.
If it's not working check the connections and for power at the accuator before possibly changing it.
If the accuator is working, it could be a problem with the shift fork inside the differential. Also, have
someone start the truck and engage the 4x4 then look to be sure the output shaft from transfer case to the front axel is turning. The safest way to do this is to have all 4 wheels up on jack stands.
Hope this is helpful.