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Originally Posted by yotermanic
I'm sorry, I'm in a Ford Dealership and that's the most common problem I've found so far. I had no way of knowing you'd know what you're talking about. This may be obvious but a lot of people overlook it. Have you removed the shift motor and seen if it moves when switched? Or is it a manual transfer case? Also, if it's electronic four wheel drive, look to see if your GEM module piggybacks on the back of your interior fuse panel. Most my experience is with 250s and up but I know some of those 150s have a service message about water intrusion when the GEM piggybacks on the fuse panel. Apparently it is from the windshield and most customers don't notice the leak, they notice symptoms related to the GEM. If it's auto four wheel drive, a output shaft speed sensor that's out could cause it to believe one axle isn't moving and automatically lock into and keep it in four wheel low.
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thanks for the very intelligent reply.
this is the f 250 and just finished replacing the shift motor $250 , the motor does not activate when switching from 2wd to 4wd or 4low.
Have checked fuses vaccum and electrical connections right front firewall , kinda lost at this point, wonder if the 4wd switch on dash could be faulty. thanks again for your experienced answers..