Question about 2000 GMC New Sierra 1500

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When i engage 4 wheel drive on 1995 gmc 1500 the 20 amp fuse blows . replaced tranfer case switch and front axle switch

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 507 Answers

SOURCE: 1990 GMC Sierra 4x4 1500

the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.

Posted on Sep 22, 2008

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SOURCE: four wheel won't engage

Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

Posted on Dec 29, 2008

  • 1 Answer

SOURCE: 1994 gmc 4x4 non engaging high range four wheel

ita a fuse i just fixed min i had same problem

Posted on May 17, 2009

  • 59 Answers

SOURCE: 4wd will not engage on 2002 gmc sierra 1500

try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)

Posted on Jul 04, 2009

Molson02536
  • 3854 Answers

SOURCE: 1995 gmc yukon wiyh 6.5 diesel 4 wheel drive will

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. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

Posted on Jan 02, 2010

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1 Answer

My 1993 GMC sierra 4x4 kepps blowing fuses when I try to engage it


Unplug the front axle actuator. Replace the fuse. Put in four wheel drive. Did the fuse blow? If not replace the front axle actuator.

Nov 16, 2014 | 1993 GMC Sierra

1 Answer

When put in 4 wheel drive the tranfer case engages but the front axle does not turn?


Check the 4WD fuse. They are also prone to bad front axle actuators. They are electrically controlled and sometimes too weak to engage axle shift fork. If fuse good check for power and ground to actuator, if good you'll need an actuator. They do have issues with the transfer case encoder motor, so make sure it actually engages as you said. Front driveshaft turning.

Jan 28, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

When shifting into four wheel drive the fuse blows


There are 2 switches (one on top of the transfer case left side above shifter) this then sends power to the electric actuator to engage the front axle. Quite often the actuator is internally shorted causing fuse to blow. I'm sorry I don't have a schematic in front of me. The second switch is on the front axle and will illuminate the 4wd light when engaged. It could be shorted but won't inhibit 4wd operation (its a separate circuit). Remove the connector at the front axle actuator and jumper it directly to battery (using a fused jumper). if it operates, and fuse doesn't blow, then you have a wire chaffed to ground. Most often its near the front axle harness that gets rubbed thru. If the fused jumper blows then obviously the actuator is no good. I hope this helps some.

Jan 26, 2011 | 1991 GMC Sierra

2 Answers

Every time i push the button for the four wheel hi it makes the click noise in the front but DOES NOT ENGAGE. only the back tire spins


Depending on the year, it is not posted, it may be a bad transfer case motor. The clicking you are hearing is the motor trying to engage transfer case & front axle. It looks like a windshield wiper motor & when it gets power & works properly it engages front wheels. Again, depending on the year, may be 4 wheel drive actuator or switches bad on front axle or transfer case.

Jan 17, 2011 | GMC Jimmy Cars & Trucks

1 Answer

The 4 wheel drive does not work the transfer case engages but not the front diff any suggestions


check accuator and wiring and fuse for 4x4.wiring also goes from axle to tranfer case

Dec 23, 2010 | 1988 GMC K3500

1 Answer

1996 gmc jimmy started making noise sounding like it is is right front was told need to replace wheel hub which was done. Still making the same noise in 2 wheel drive. when you push button for 4 wheel...


Sounds like your front axle is trying to engage but does not engage fully.check your vacuum going to the t-case switch and then if that is ok check your vacuum at the front axle actuator.It is located under the battery tray.

Dec 06, 2010 | 1996 GMC Jimmy

3 Answers

4 wheel drive will not engage on my 1989 gmc sierra 2500?


actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

Jan 07, 2010 | 1989 GMC Sierra

1 Answer

Four wheel drive wont engage. Tranfer case is


Sounds like you either have a vaccum leak or your 4 wheel drive actuator is not working to engage the front differential.On my 98 ram there is a black and red plastic lines that are used for the vaccum lines. They are underneath and go from the transfer case to the front axle, check to see if one or both might be cracked or broke completely.If the lines are good then it could be your actuator on the front axle. A new one is about $93 at advance auto parts and not very hard to replace

Dec 15, 2009 | 1998 Dodge Ram 1500 4WD

1 Answer

1988 ford ranger push button four wheel drive an it wont engage all the wires are good it just clicks when u push the button.. what should i look for to make the four wheel drive work again it wont...


Start out with buying yourself a $25 book from the Parts House. The I would go to the front HUBS, secure & safety vehicle before you do anything, Clean, Inspect, Lune & Repair front Hubs as required, get the brakes while you're there. Check your drive line, axles, u-joints etc. Clean , repair , replace as needed. Check for Tranfer case Operation. Is there power going to the front Axle when 4WD is engaged? do you feel a change when you engage the Transfer Case? Have you checked the Power on the circuits? Have you Manual or Auto-locking Front Hubs? Answer all those Questions & read before you do anything.

Nov 03, 2009 | 1988 Ford Ranger

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