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4X4 fuse keeps blowing

Tiny
TIREGUY79
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I have the truck listed above 1500 classic. The issue I’m having is one day I needed to use 4x4 it is a manual shift system and it wouldn’t work. I checked the fuse and it was blown. So I put new one in it and it worked then while driving it while it was locked in it blew again. I was still able to stay in 4x4 and shift back to 2wd it just wasn’t lighting up on dash but I was skeptical about it not disengaging. So I put new fuse back in to shift it back to 2wd drive no big deal, but today I got stuck so I tried to put new fuse in and it would blow it soon as I tried to put it in. I’ve tried new actuators new shift sensor, looked for broken wires, cleaned up the body ground. I’m lost need help. I know little bit but suck with electrical. It just decided one day not to work and start doing this.
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Sunday, December 8th, 2019 AT 3:07 PM

10 Replies

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

I attached a wiring diagram for you.

Tell me which fuse fails. You will need a test light or voltmeter to do some checks.

Roy
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Sunday, December 8th, 2019 AT 3:23 PM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
It is the fuse labeled 4x4.
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Sunday, December 8th, 2019 AT 3:28 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What is the fuse number?
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Sunday, December 8th, 2019 AT 3:33 PM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
No number just says 4x4.
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Sunday, December 8th, 2019 AT 3:38 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Can you post a picture of the fuse box and the related fuse?

Roy
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Sunday, December 8th, 2019 AT 3:42 PM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
It looks just like picture. I sent I’ll send a picture of fuse box.
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Sunday, December 8th, 2019 AT 3:44 PM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
The fuse is missing in picture that is labeled 4x4.
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Sunday, December 8th, 2019 AT 3:46 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, can you disconnect the actuator and install a fuse and see if it still fails?

Roy
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Sunday, December 8th, 2019 AT 3:55 PM
Tiny
TIREGUY79
  • MEMBER
  • 35 POSTS
I will tomorrow for sure. I will keep you posted. It’s getting dark so I’ll have to wait.
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Sunday, December 8th, 2019 AT 3:58 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds good. Keep me updated.

Roy
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Sunday, December 8th, 2019 AT 4:04 PM

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