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Looked it up in the Service Manual. Same same. However, I also looked up the "Symptom Chart" 4x4 indicator always on gives a few possibilities.
ABS module test:
Make sure you're in 2wd. Make sure the indicator says 4x4. Disconnect ABS module. See if light goes off.
Shows an image disconnecting "GEM C240c". I don't know if that's the main GEM plug or not, someone else can hopefully chime in. Does the light go off?
Instrument cluster test:
Again, image showing a disconnect of "C250c". I don't know if that's the main cluster plug. Does light go off?
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776