text: 93 chevy truck blows fuse when put in 4x4? my friend has a 93 chevy z71. when it is put in 4x4 it blows the fuse. replaced the actuator at the front diff. and it does the same thing. any ideas i had a 98 that did the same. if it's done any offroading, it may have shorted out a wire under the truck. it could be grounding out on the frame. get it to a mech. or just look yourself for any loose wires