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Discussion Starter · #1 ·
I just replaced the carpet in my 94 Blazer. Now the 4wd is not engaging. Is there an electrical connector at the floor shifter that I missed plugging in? I don't remember.
 

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There is a switch on top of the Xfer case that controls the front axle actuator. But you shouldn't have disturbed it putting in carpet. Its connection is outside the cab. The only electrical that I know of in the shift cover you removed to install carpet, are the 4x4 indicator lights. Maybe the 4x4 light came unplugged and is causing the problem? Or just not lighting up? Bulb may have burned out.
 

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Discussion Starter · #3 ·
It would be an odd coincidence, but it gives me a place to start. Thank you!
 

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If you have verified the front axle is not locking in. Then the problem may be in the front actuator. 94s have the old thermal type. Which are known to fail. If it is bad, the 4x4 wont work, and the light for the front axle will not come on. They are easy to replace.
You can upgrade to the newer motorized type. It works a lot better than the older thermal type..
 

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Discussion Starter · #5 ·
If you have verified the front axle is not locking in. Then the problem may be in the front actuator. 94s have the old thermal type. Which are known to fail. If it is bad, the 4x4 wont work, and the light for the front axle will not come on. They are easy to replace.
You can upgrade to the newer motorized type. It works a lot better than the older thermal type..
These are the symptoms. I will start with the front actuator. Thank you!
 

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Discussion Starter · #6 ·
Do I have to specify the motorized type or is that the standard now?
 

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Do I have to specify the motorized type or is that the standard now?
I believe the motorized actuators were installed 98'+ model years
 

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Same for Gas and Diesel:

Here is an thread on the upgrade:

Here is YT videos but there is a lot of them if you want to watch it and learn how to do it.



You can also google "GM 4WD actuator upgrade"
 

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Maybe check the conns. at the convenience center are plugged in good.
They will not stop 4wd but the lights won't work.

643750
 
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This make sense since it happened after a carpet replacement.
 

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Discussion Starter · #11 ·
Is the simplest test to place the truck in 4wd and put a test light across the actuator connector? Light "on" means the actuator is bad?
 

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Yes. Also if you are not getting 12v to the actuator check the fuse.. When the Actuator goes bad it can blow the Xfer case fuse.
 
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