Hey mate,
If you wanna check its definitely the light and nothing mechanical theres an easy test:
find a car park or somewhere you can turn the truck around easily, put it in 2 wheel drive, turn full lock right or left and drive. If its still in 4WD the wheels will skid and fight against you. If its in 2WD it will just act normal. Easy way to find out if its mechanical issue or not.
As suggested though sounds like you've knocked wires around on the gearbox/transfer case.
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