I have 97 chevy silverado 1500 z71.when I put it in 4x4 the 4x4 fuse blows out. The transfer case shifts and locks in but the front diff does not. Now when I unplug the actuator on the front diff it doesn't blow the fuse. Could it be I need to replace that
Yes replace actuator
I have seen them short out in the past.
Inside them is a heater which warms a waxy substance. When heated the wax expands and pushes a lever to engage the axle.
They are available at your local auto supply rather than the GM expensive versions. I have used many of them without any problems.
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