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Blowing 4X4 fuse with encoder and actuator unplugged

Tiny
SCHMIKYL
  • MEMBER
  • 2006 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 191,000 MILES
My 4x4 worked when I got the truck a month ago, but here recently just got a "Service 4x4" code show up. I replaced the actuator and then noticed that the 4x4 fuse in the vehicle was blown. As soon as I replaced it, it just kept blowing once I turned the ignition on. Any clues or ideas?
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Wednesday, November 4th, 2020 AT 2:52 PM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

I attached the wiring diagram for you to view.

Can you tell me which fuse fails so I can trace that wiring for you?

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Roy

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Wednesday, November 4th, 2020 AT 3:24 PM
Tiny
SCHMIKYL
  • MEMBER
  • 4 POSTS
The 4x4 fuse in the cab. Marked 4x4.

https://fuse-box.info/wp-content/uploads/2018/09/Chevrolet-Silverado-mk1-1999-2007_in1_99-02.jpg
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Wednesday, November 4th, 2020 AT 4:49 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I attached what the fuse controls.

If you disconnected the switch and actuator and the fuse still fails, the wiring is shorted between the fuse block and the 3 components.

Roy
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Wednesday, November 4th, 2020 AT 5:09 PM
Tiny
SCHMIKYL
  • MEMBER
  • 4 POSTS
I unplugged the 4x4 selector and unplugeed the plug under the hood for the actuator and it still blew the fuse.
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Thursday, November 5th, 2020 AT 11:06 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, as I stated if the fuse still fails it is a wiring issue. The wiring is shorted somewhere after the fuse.

Roy
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Thursday, November 5th, 2020 AT 11:14 AM
Tiny
SCHMIKYL
  • MEMBER
  • 4 POSTS
Are you thinking between the interior fuse panel and the plug of the actuator under the hood?
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Thursday, November 5th, 2020 AT 11:17 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, I am. It could be there or to the switch.

Tracing the harness is the next step.

Roy
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Thursday, November 5th, 2020 AT 4:23 PM

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