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Unread 06-06-2006, 07:58 PM   #1
kaybone
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How I fixed my 4 wheel drive light(mini-write-up)

Well, I guess I'm just one of those OC nut cases, that has to have everything work, or I think that my Jeep is an airplane, but when my 4-wheel drive indicator light went out it really bugged me. Like it really wasn't going into 4 wheel drive because the light was off. Well here's how I fixed mine.

1) Makes sure the transfer case linkage is adjusted right. FSM tells you how to adjust the linkage.

2)Make sure the vehicle REALLY is going into four wheel drive. You can do this by a fast start on a gravel road and watch the skid marks or you can put the Jeep up on jacks, leave the emergency brake on, put it into 1st gear put it into 4wheel and just slowly take your foot off the brake just enought to watch the front wheels turn a bit. (I stalled when I did this, but the front wheels did turn)

3)Check your fuses in the fuse block behind the glove compartment to make sure they're allright.

4)Determine if the light works. Unplug the connector off of the transfer case switch
located on top of the transfer case in front on the drivers side. IT just lifts off of a small clip, very easy. Connect a jumper wire between the connector you just pulled off and a good ground. With your ignition switch in the on position the light should light if it is good. If it doesn't it's probably the bulb. Mine lighted so that narrowed it down to the transfer case switch.

5) I replaced my transfer case switch with a new one and a new o ring.
Part#'s: Switch: #J8134473 O-ring: #4338956 = $31.01(dealer items)
Use a deep 7/8" socket and torque to 15-25 ftlbs.

Ya know, that switch is a really weird thing. It is a ball bearing vacumm type switch that turns on the circuit when a little ball is sucked away from the contact.
Does anyone know how this works? I didn't realize there was that much of a vacuum in your transfer case when you tuned on the 4 wheel drive. Just wondering how the thing really worked.
Have fun with your own light.

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Unread 06-07-2006, 08:35 AM   #2
kaybone
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A quick update to this: After talking with a few folks I guess that switch is not vacuum operated at all, but it is a mechanical switch. Some sort of lever or cam in the xfer case bumps against that small ball bearing in the switch to complete the circuit. Explains my vacuum mystery.
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Unread 06-07-2006, 09:31 AM   #3
Luksi
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Just wondering what OC has to do with this...
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Unread 06-07-2006, 02:19 PM   #4
vector6
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Quote:
Originally Posted by Luksi
Just wondering what OC has to do with this...
Thats easy...


you should always drink Orange Cola while working on your jEEp..

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Unread 06-07-2006, 02:24 PM   #5
jzmtl
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Before you do this do a self diagnostic test to see if the light comes up at all. If not it's probably a burnt out bulb so work on that instead.
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Unread 06-07-2006, 03:02 PM   #6
kaybone
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Quote:
Originally Posted by jzmtl
Before you do this do a self diagnostic test to see if the light comes up at all. If not it's probably a burnt out bulb so work on that instead.
See item #4. I also did the self diangostic test and interestingly enough, my lamp did not light during the test that cycles through all the dash lights, but it did light when I shorted the connector to ground. I have to admit I'm not %100 percent sure I was in 4 wheel drive when I did the dash diagnostic test, but I think I was.
I wouldnt think that would matter either way during that dash lamp test. Maybe someone knows for sure.

Edit: 4 wheel drive light will normally light with key in on position and xfer case in 4wheel drive position when the xfer case switch is working and the bulb is good
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Last edited by kaybone; 06-07-2006 at 04:02 PM..
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Unread 06-13-2006, 11:51 AM   #7
Toombs
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Quote:
Originally Posted by Luksi
Just wondering what OC has to do with this...
OC = Obsessive Compulsive. He's afflicted with OCD (Obsessive Compulsive Disorder). Takes one to know one I guess.

Mike
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Unread 12-07-2006, 10:10 PM   #8
keithert
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Good info. I'll have to try this.
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Unread 12-08-2006, 08:51 AM   #9
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Quote:
Originally Posted by Toombs
OC = Obsessive Compulsive. He's afflicted with OCD (Obsessive Compulsive Disorder). Takes one to know one I guess.

Mike
Funny - I was thinking the same thing!
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Unread 01-23-2009, 11:44 AM   #10
vtx531
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Quote:
Originally Posted by kaybone View Post
I wouldnt think that would matter either way during that dash lamp test. Maybe someone knows for sure.
I did this because my switch is bad and the bulb lit, I wasn't in 4wd. How would your Jeep know it's in 4wd if the switch was broken anyways? That's weird.

I just ordered a new switch $11.49 shipped from www.4wd.com. HERE
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Unread 01-23-2009, 12:17 PM   #11
A2SuperCrew
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I found the switch at Morris 4x4 for about $10. They've got the o-ring too.
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Unread 01-24-2009, 07:29 AM   #12
mudtire
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I bought my switch at Quadratec for about 10$. Fixed the problem easy.
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Unread 01-24-2009, 07:48 AM   #13
97casteeltj
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guess i'm a loser , i don't need a light to tell me i'm in 4wd or not
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Unread 01-24-2009, 08:28 AM   #14
TJDaveX
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Not a loser, just means you're not OCD. Is your shop messy? Does your laundry pile up before you wash it? Does your sink have some dirty dishes in it, even though you have a dishwasher? My wife is OCD, and those things drive her crazy!

So far, my light still works. But, I hardly ever notice it. It's too easy to tell if you are in 4wd or not. Good to know how to fix it. But, if mine stops working, I don't think I will try to fix it...............and I never mow my lawn before it needs it.
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Unread 01-24-2009, 08:32 AM   #15
Ron Burgundy
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this forum has a lot of great info.
Problem is, the search tool sucks.
So there are 400 threads on the same thing.
This thread here:
http://www.jeepforum.com/forum/f9/4x4-engaging-but-no-indicator-light-608616/

has a lot of good info on this topic. n00bs will appreciate it.
do we have any mods, who can add the good threads to the faq thread?
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