Hoping someone in here can help me as I’m having a mildly similar issue here goes it’s gunna a lot lol,

but I’ll get right to it I have this 1993 f150 and the 4x4 won’t work. So here’s what I’ve done so far, started simple checked fuses/relays all good, then onto the switch it turns on and when pressed I can hear the lil box behind the kick panel click once so all good right? then I checked the lil box itself unplugged both connections and tested, had roughly one blink a second (standard I believe) ok so next I checked wiring followed it from the shift motor connection everything seem fine until where another connection is by the front driveshaft it was unplugged and dirty as hell so I took that itself apart and cleaned it plugged it in and to my surprise it went into 4wd well for about 30 feet then it would disengage and not engage again on a whim I replaced the actual shift motor and still nothing but now the switch itself has no lights when clicked but will still click once when pressed (the box in kick pannel clicks) but no power to anything still. When the truck was bought I clicked the 4wd and seemed to engage but obviously wasn’t. When I started my dig into this problem I did notice a couple things A that unplugged connector was pulled out and the Christmas tree connection was pulled from its mount. B that again behind the kick panel there was 2 more pulled. Seems the previous owner knew the 4wd was messed up, attempted to fix but couldn’t. Hence why I think he unplugged the connection by the drive shaft so it again seemed like 4wd was working. Anyone have any ideas? I also pulled the motor again and had a buddy try to engage but again nothing. My next check is going to ensure power is actually going to the motor itself. But if there’s no power what would be broken at that point? Starting to doubt my mechanic skills lol and I would deeply appreciate any help anyone can offer.

Also I just noticed that the shift motor connection center pin seems to have been pushed in a little by a flat head? The pin is pushed in a little and minorly split, the shaft itself is ok tho. Could it be that simple?

 

Dean, plug everything back up to normal and to begin with ,let’s test the processor board .Jumping around then changing parts your throwing money at it .95%of the time it on this site, the shift motor was causing problems .
Access your processor board (kick panel)there is a two wire harness left side- (front).unplug that two wire harness .Next key on acc ignition -push the white square button on the bottom edge of processor board and it will turn on a red light(led)If the red light flashes you have a problem with you actuator motor ,if it stays bright red ,it the processor board .Tell us what you have ??? That’s testing to start and will identify correctly where to go next .TR

 

Before testing make sure everything is as normal, shift motor hooked up and harness plugged up etc……..

 

well yes I already followed it until I couldn’t anymore everything’s connected.

 

sorry for the late response just got off work for the second job. It will flash once per second. And I didn’t throw any money at it I had an old t case that came off a different 93 that I knew worked previously. Certainly wouldn’t want to waste that 160 bucks lol. As stated above I’ve followed the following steps. Pulled relays/fuses, tested the processor board. Blinks once per second doesn’t stay on. Hence why I put the different actuator on, followed the wires and cleaned the connections.

 

Good ,you diagnosed the problem,actuator motor .You can try rebuilding it ( google that) or Jeffs bronco graveyard ,rock auto and others carry them .TR

 

think it could be that even tho I swapped it out with a WORKING unit and still nothing? I ain’t trying to be rude but the one now installed works I know that for a fact. Again once u replaced the motor it’s self the 4x4 lights stoped working and no 4x4

 

Is the working unit compatible with your year truck? Are you stating once you swap the working unit , you get nothing???? If you tested the motor/case out of the truck , it could be possible the alignment is out .Just to understand you are not saying motor actuator,not swapping the motor to the gear case???

 

yes, I was meaning the actuator motor, and yes, it is out of a different 1993 F150 as well just different trim model. And yes, once I swapped the new one no lights or nothing kind of why I was feeling sus about damaged terminal pin in the actuator motor connector. As for it not being aligned before I put it on and actually tested it. It did not move whatsoever, as well as it still slips on without me having to turn or force it.

 

Ok just trying to get on the same page since the motor actually drives the rotary cam into one of three positions .If it’s off between positions is why there is nothing .After rereading your first post ,do not unplug both connectors- only the two wire connector then press the white square button .Just clarifying that!!! Blinking light = actuator motor .I can’t remember right off hand but power can be applied to different color wires to shift the cam .There is some good you tube vids that explain we’re power can be applied . TR

 

ok great thank you when I get a chance to try again I’ll let you know the results aswell I’ll look into the wire idea I believe it’s the orange and yellow but not 100% on that.

ok I’ll re check it the