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How do you check the actuator on the transfer case on a 1993 ford 4wd

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  • 103 Answers

Do a continuity check on switch with OHM meter. Repalce as needed.

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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SOURCE: 1995 gmc jimmy 4wd high not working

sounds like it is loosing vacuum check all the lines for a crack even the engine lines will cause it to loose vacc. pressure. if it is not run to the vacuum reserve canister you may not have enough vacc. to hold the actuator in several times I just run new lines and that helped and not very costly.

Posted on Dec 25, 2008

  • 2 Answers

SOURCE: it's a holden rodeo turbo/diesel 2005.check 4wd light on

I did this a few days back and is all fixed. Can email a picture/diagram for anyone that needs it.

Posted on Apr 24, 2009

cincinaty5
  • 132 Answers

SOURCE: 1993 chevy 1500 4x4 pickup no power to front actuator

check all wire conections also replace the actuator on the front axle but check for power there first if you have power replace that switch as well .

Posted on Aug 27, 2009

robslac24
  • 2 Answers

SOURCE: 01 Chevy Silverado 4 X 4 not working. 4WD light

Having the same exact problem but with my 1999 escalade. Thought it was the actuator bought a new one installed it transfer case would engage but front end wouldnt lock. Took it out of housing left it plugged in got a friend to go through all the 4wd for me and the plunger never moved out the actuator. Checked my wiring harness which is a four prong ann it had one hot prong like it is suppose to. Traced wires even replaced dash switch same problem. Taking it to local dealership tom to have it checked for codes. I was told it could be the transfercase actuator even though its workin that actuator is what sends power to the front to engage the actuator to lock the differential.

Posted on Sep 16, 2009

Molson02536
  • 3854 Answers

SOURCE: 1991 K2500 pickup, 350tbi,4l80 trans, 4wd not

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.

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.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1994 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED
INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Posted on Jan 10, 2010

Testimonial: "Thank you for the information it was helpful to know the wire colors, I'll be working on it again later in the week and hopefully get it going."

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1 Answer

2001 ford f150 4x4 does not engauge


We may need more details. Does your 4wd dash light illuminate? Do you hear clicking from the dash? If it does not, you are dealing with a fuse or transfer case issue. If you see the light and hear clicking, it likely is not your transfer case but either your 4wd solenoids (attached photo) on the passenger side firewall or the actuator on the front differential. Pop the hood and listen for clicking from the solenoids, if the click, direct your attention to the actuator. It is vacuum actuated so it should move about an inch when engaging and disengaging 4wd. It sometimes gets stiff so see if you can move it by hand to free it up.

Feb 01, 2014 | 2001 Ford F150 Styleside SuperCrew

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My 2004 Ford F150 4WD feels like its in 4 low


Ok the motor was working on the transfer case but was it turning inside the transfer case all the way? Pull it back off and manually turn the inside of the transfer case to 2wheel drive.

Apr 09, 2017 | Ford F-150 Cars & Trucks

1 Answer

1993 chevy pickup 2500 4 wd. 4 wheel drive will not engage. replaced actuator. still did not engage. replaced 4wd switch on transfer case. still does not engage. the 4wd indicator light comes on but it...


physically watch the actuator and have someone else activiate it. If it moves like it's supposed to...you could have a broke axle, third member or even the locking clips on one of the front hubs...

Dec 18, 2010 | 1993 Chevrolet K2500

1 Answer

I have a 93 chevy 2500 4x4 truck. It will not go into 4 wheel drive. The thermal actuator has been replaced.


4wd fuse is good. Check the switch on top of the transfer case. This is what sends power to the actuator.

Oct 30, 2010 | 1993 Chevrolet C/K 2500

3 Answers

1993 K1500 4 wheel drive not engaging. What is


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.

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.

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. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the whining or grinding noise you hear.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1994 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Feb 23, 2010 | 1993 Chevrolet K1500

1 Answer

Where is the actuator switch located on the transfer case?(the switch that engages the 4wd)Thanks!


The actuator solenoid along with the axel solenoid
switch are located at the rear of the front axel on the
right side.And the transfer case switch is located on
top of the transfer case left side. Hope this helps.

Feb 08, 2010 | 1993 Chevrolet K1500

1 Answer

1993 chevy 4wd p/u. when put in 4H there is no action


Yes the actuator on the front differential goes out all the time. I would recommend changing it. they are about $70.

Oct 26, 2009 | 1993 Chevrolet C1500

1 Answer

98 Chevy S10 4wd drive will not engage when button is pushed


your problem sounds like either the transfer case control module located where you hear the clicking sound, or the actuator on the transfer case itself.

try unplugging the transfer case control module and then plug it back in, try engaging 4wd again (make sure your in neutral, coasting at 1-2 mph might help as well) if it still doesn't work check the actuator itself to see if the actuator is trying to engage. if the actuator is trying to engage but doesn't, take the actuator out and check it for wear or damage. if the actuator seems fine and it responds to the buttons when pressed i'd go after the transfer case control module as the culprit. ran into that a few times on those s-10's. 3 out of 4 that i've seen were fixed with a new tccm. 1 of the 4 needed an actuator, check your local junk yard for a working tccm or actuator.

hope this helps!

Feb 17, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

Transder case not enganing


it can be done but it is a pain in the ***.....its like converting from an automatic to a stick......its a pian but could be done.

Dec 22, 2008 | 1992 Ford F250

1 Answer

1993 FORD RANGER 4 WHEEL DRIVE


there is an actuator on the back of the transfer case that likes to fail odds are this is where your problem is. check power and ground here and if you have both replace the actuator

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