Question about 2001 Chevrolet Blazer

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01 blazer 4.3 4x4 tccm erratic clicking making all indicator lights light on 4 button switch w/service 4 wheel drive then all lights go out on 4x4 does this clicking whether key is on or off key out

Turns out after all the wire shaking and moving,the negative terminal for batt had stripped threads made bad connection would start and run but tccm would lose power and start clicking,replaced the bad connector and battery,still same condition.

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  • Linda Brown
    Linda Brown Nov 08, 2017

    well,it is doing the same thing again,at my limit!!! grrrrrr.



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  • 23 Answers

I had the same thing happen when my battery terminal was loose; it killed the alternator, so the battery doesn't get charged. There are cheapo battery/charging system testers that plug into the socket, or your local auto parts store often offer free testing of the alternator and battery.

Posted on Jan 04, 2018


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Posted on Jan 02, 2017



  • 2 Answers

SOURCE: when you push the 4

a lot of 4wd you have to back up for a few feet to disengage the hubs after you tourn them back to 2wd

Posted on Dec 13, 2008


  • 1 Answer

SOURCE: 1999 chev blazer 4x4 system

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.

Posted on Dec 18, 2008


  • 62 Answers

SOURCE: 4 wheel drive does'nt work on my 1999 jimmy

change the selector switch first it is by far the cheapest

Posted on Dec 20, 2008


  • 1 Answer

SOURCE: 1993 Chevrolet S-10 Blazer won't go into 4-wheel drive

no fuse...mine was stuck in low and i had to replace vacume hose in the transfer case about 200.00 bucks

Posted on Dec 31, 2008


Harvey N Tawatao

  • 3854 Answers

SOURCE: 4 wheel drive service light is on, wont engage

On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

If I were you, I would buy a new heated actuator. They are available at most auto parts stores, and are about $90. They are also on eBay for about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.

Good luck, That actuator is usually the problem 90% of time but check the fuse first in your fuse box.

Posted on Dec 30, 2009

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