ATC fuse 20 amp ? Power to the ATC control module & encoder motor . Shorted circuit in electrical wiring to one of the componets listed above . Do you know what a electrical diagram is ? How to use a DMM - digital multi-meter to test electrical circuits ? Free wiring diagrams here
http://www.bbbind.com/free-tsb Enter vehicle info year , make , model an engine size. Under system click on driveline / axle . Under subsystem click on transfer case controls . Click the search button ,then the blue link. First link / first diagram ,top right . ATC fuse - orange wire to encoder motor an atc control module . One of these has a short to ground probably .
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