2000 Chevrolet Silverado 1500 Q&A

2000 Chevrolet Silverado 1500 Question: front transfer case will not engage 4wd;dash switch replaced, actuator also

I just replaced the switch and actuater with no success,is there a relay, in line fuse???what are the fuses labeled in the underhood "electrical center"??? that pertain to the 4wd system,,what component is in line befor the actuator? -
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