1990 Chevy Cheyenne 4 wheel drive not engaging

1990 CHEVROLET CHEYENNE
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Drive Train Axles Bearings problem
1990 Chevy Cheyenne Four Wheel Drive Manual

i have 1990 chevy and the front tires are not engaging into 4 wheel drive, i do know the front drive shaft is locking into gear. Also the 4 wheel drive fuse keeps blowing out. I do not know what is wrong with it, i have checked the wires that run into the front axle, they are good.
anyone know what this could be please help.
Sep 20, 2009 at 9:47 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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