It would be best to have someone with a scanner to read codes for the transfer case module, the cheap code readers probably won't be able to do this. There are a couple service bulletins about the "service 4wd" lamp coming on, depending on what it's actually doing and what code is set depends on the repair. The bulletins state one repair to reprogram the transfer case module, the other bulletin states a concern with the dash switch being faulty. Keep in mind that it could still be something else.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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