4x4 woint in gage put in 4 lo you can tell the trans is in 4 lo but the front wheels are not the lights do switch on the buttons from 2to 4high and 4 low
Check for codes .
Jumper pin 13 to ground and read codes on 4 wheel light.
Then remove T/L ctry 20 amp fuse for a minute and reinstall and recheck codes.
Post back codes.
MT
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Remember proper testing gives us the answer to many problems.
MT
