What is the fuse on a Chevy Tahoe 4 wheel drive?
What is the fuse on a Chevy Tahoe 4 wheel drive? So check the fuse. When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator. When shifted out of 4wd, the switch opens up and no voltage goes to the actuator. Where is the 4 wheel drive fuse on a 1999 Chevy Silverado? Look in the box at the end of the dash on the drivers side. 36 people found this helpful....