Does a 4x4 1994 1500 Chevy silverado still lock in four wheel drive with out fuse the slot of box?

No, a 1994 Chevy Silverado 1500 4x4 will not engage four-wheel drive if the actuator motor is not receiving power. The fuse is just one possible point of failure in the electrical system; a bad switch, wiring harness, or the actuator motor itself could also prevent 4WD engagement. The actuator motor is what physically engages the front axle. While the fuse in the under-hood fuse box is a common culprit, a missing fuse would prevent the system from working.