To diagnose a 4WD problem, you should consult your owner's manual's electrical diagrams. These diagrams will show you which fuses and relays are involved in various aspects of the 4WD system (like the motor for the transfer case, etc.). You'll need to check these individually.
The fuses themselves are usually located in one or more fuse boxes:
* Under the hood: This box typically contains higher-amperage fuses and may include fuses related to the 4WD system.
* Inside the cab: Often under the dash, this box contains lower-amperage fuses and may also have fuses for 4WD-related components.
Without the wiring diagram from your owner's manual, it's impossible to definitively say which fuse(s) are involved. Checking every fuse in both boxes is your best bet to eliminate the possibility of a blown fuse causing the problem. Remember to always disconnect the battery's negative terminal before working with the fuse boxes.
