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  1. #1
    Junior Member
    Join Date : Aug 2009
    Posts : 5
    Likes: 0

    Blinking 4 wheel drive light

    I have a 96 GMC 1500 Sierra 4x 4. It has the push button
    4 wheel drive buttons on the dash. Today I put it
    4 wheel drive (high or low) and the light in the switch
    just blinks. Where do I start looking??
    Thanks,
    Vance

  2. #2
    Senior Moderator
    Join Date : Feb 2006
    Location : michigan
    Posts : 8,537
    Likes: 14
    it's blinking because you hit 4low while in gear. put in nuetral if you want it in 4low, otherwise push the 2hi button and be on your worry free way.
    <----just your average 5.3

  3. #3
    Senior Member
    Join Date : Jul 2008
    Location : OK
    Posts : 7,195
    Likes: 3
    Yep, Its waiting for you to stop the vehicle, go into Neutral then once its engaged, it will stop blinking, stay solid lit, to tell you its engaged and you can now go into gear and move. IF you are doing all that right and it continues to blink, then you likely have a defective engagement solenoid and it is not going to engage.
    85 Sierra Classic K1500 350/A833/NP205 10Bs 3.73's 4in on 33's
    85 Silverado K20 454/Th400/NP205 14FF Det Locker/10b ARB AL 4.56's 6in on 35's
    85 Silverado C20 Olds 455/Th400 14FF 3.73 PTrax NoSlip

  4. #4
    Junior Member
    Join Date : Aug 2009
    Posts : 5
    Likes: 0
    Quote Originally Posted by hotrodpc View Post
    Yep, Its waiting for you to stop the vehicle, go into Neutral then once its engaged, it will stop blinking, stay solid lit, to tell you its engaged and you can now go into gear and move. IF you are doing all that right and it continues to blink, then you likely have a defective engagement solenoid and it is not going to engage.
    There is definately something wrong, it blinks when I try and
    shift from 2 high to 4 high. (4 high blinks)
    I have no idea where to start checking?
    Thanks,
    Vance

  5. #5
    Senior Member
    Join Date : Jul 2008
    Location : OK
    Posts : 7,195
    Likes: 3
    That is normal for it to blink, then should go solid after a few seconds telling you that 4high has engaged. IF its not doing that, then I would first suspect the solenoid on the transfer case.
    85 Sierra Classic K1500 350/A833/NP205 10Bs 3.73's 4in on 33's
    85 Silverado K20 454/Th400/NP205 14FF Det Locker/10b ARB AL 4.56's 6in on 35's
    85 Silverado C20 Olds 455/Th400 14FF 3.73 PTrax NoSlip

 

 

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