You need to check for a bad fuse or relay. Also there may be a speed sensor problem in the transfer case. Perform an OBDII scan before doing any repairs. this stuff is complicated and expensive. Let the ODBII scan be your guide to avoid buying parts you don't need. The 4WD drive train and axels, should have been serviced at 80,000 miles. (2004 ?)
SOURCE: I have a 2004 Ford
Hello nasenterpris
You would notice somthing if the transfer case engaged, even if the hubs did not. The first thing I'd do, before crawling in the snow is to stop by my mechanics or an autozone and have the OBDII
scanner hooked up to see if any DTC codes poped. A 4wd related code may not set the mil light
on the dash. There is a 4wd ctrl. module and a few switchs+solnoids located under the truck under
the hood and under the dash that are 4wd related and if there is a trouble code it can narrow the
search greatly. In the meantime you can check these fuses that are either directly or in directly
related to the 4wd #45 #19 #27 #111 Hope this helps.
Testimonial: "Thanks for the input. I actually own a decoder and will check to see if a 4WD issue is present. I checked the fuses you listed earlier today. THX!"
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