Any write-ups on how to change alternator on 4.0? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Any write-ups on how to change alternator on 4.0?

ECGS Black Friday Sale!!6th Annual, Beat Your Wife to the Credit Card Sale!50 in light bar /A pillar mount less than 500 at JeepHut.c

Reply
Unread 09-19-2011, 11:13 AM   #1
MountainMan864
Registered User
1999 TJ Wrangler 
 
Join Date: May 2008
Location: Spartanburg, SC
Posts: 3,659
Any write-ups on how to change alternator on 4.0?

My alternator is about to go out, so I need to have it rebuilt. Cant find any writeups on stu olsens website or 4x4xplor. Anyone have a link or care to explain how to do it. Size wrenches needed etc. Where is the bolt tensioner and what size is it. What electrical connections need to be taken off etc. Im gonna clean my terminal posts and cables as well on my battery.

MountainMan864 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 11:26 AM   #2
roundlitefan
Registered User
2005 TJ Wrangler 
 
Join Date: Oct 2007
Location: Richmond, Virginia
Posts: 906
I have never changed one in my Jeep...is it that different from any other alternator that it needs a write-up? Not being a smart-***, I just assumed it was bolt, bolt, plug, ground, swap, repeat, tension and tighten?
roundlitefan is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 11:27 AM   #3
mike481
Registered User
2000 TJ Wrangler 
 
Join Date: Jul 2005
Location: Rancho Cucamonga, CA
Posts: 832
First step: DISCONNECT BATTERY

Last step: RECONNECT BATTERY

The rest I'm kind of fuzzy on.

If you want a write-up try checking the FSM
__________________
Chuck- A better dog than I could ever deserve

RIP 4-14-2012
mike481 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 11:40 AM   #4
mracoker
Registered User
 
Join Date: Jul 2011
Location: elberfeld, IN
Posts: 141
I suggest picking up a Haynes auto guide. This is not a difficult task but the guide will give let you know what you need to do.
mracoker is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 12:20 PM   #5
MountainMan864
Registered User
1999 TJ Wrangler 
 
Join Date: May 2008
Location: Spartanburg, SC
Posts: 3,659
Never had to change one before so its pretty new to me. Just started doing work on my jeep instead of getting ripped off at autoshops.
MountainMan864 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 12:30 PM   #6
1HouseMouse
Registered User
2005 LJ Wrangler 
 
Join Date: Apr 2011
Location: Garden Ridge, Texas
Posts: 396
I haven't done it in years but, get a quality rebuilt kit. I don't know if there are any good kits anymore. As long as the alternator you are rebuilding it working, it should rebuild just fine knowing that the fields and armature is ok.
Take photos of the exterior case or mark them appropriatly before disasembly. The rest needs to come from experienced folks or an instructional book. The Post Office years back stopped rebuilding their own because of the failure rate was too high as I was told. Stay away from Auto-Bone in case you would rather circumvent the rebuild aspect. NAPA or Rock Auto on line should take care you with confidence. These new alternators that interface with computers Kinda/sorta get creepy when or if they detect something you can't test and the computer picks it up. Just some thoughts.
1HouseMouse is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 12:47 PM   #7
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 23,442
Quote:
Originally Posted by mracoker View Post
I suggest picking up a Haynes auto guide.
gawd no. they have just enough information to get you in trouble.

get a Factory Service Manual. if you plan to work on your jeep, you'll need one.
Unlimited04 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 12:52 PM   #8
MountainMan864
Registered User
1999 TJ Wrangler 
 
Join Date: May 2008
Location: Spartanburg, SC
Posts: 3,659
Eh ill pass. Im tired of putting money in this jeep. I wanna fix this alternator and try to sell it. I need a 4 door. Ill just wing it and get it done. Surprised no one had a website they could send me too.
MountainMan864 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 01:03 PM   #9
timberwolf0122
Web Wheeler
 
timberwolf0122's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2009
Location: Charlotte, NC
Posts: 15,278
Here's my Durango Alternator swap thread, this should help you out.
http://www.jeepforum.com/forum/f9/du...tures-1063518/
__________________
Atheist Jeep Club Member #2
MacGyver Club Member #1
Doctor Who has died 10 times, is on his 11th regeneration and has a time machine, beat that Jesus.
I think he's calling his Jeep "Tardis," which is British slang for pimp mobile. - Dangfoo
timberwolf0122 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 01:38 PM   #10
Rubi4MyMrs
Tks 4 the upgrade MoodyJP
 
Rubi4MyMrs's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2011
Location: Trails of, Nevada
Posts: 2,515
I’m not clear on what you are trying to do & why. What makes you think the alternator is ABOUT to go out? The reason I ask is that short of a bad bearing (noise) I’ve never seen an alternator give advance signs that it is about to fail. There are actually very few parts inside the alternator that can fail short of a major electrical issue that could possibly fry the field or armature windings (never seen that). All you have, really, is a set of brushes, group of diodes (rectifier), & 2 bearings.

With that said, if you do need to remove it, disconnect the battery, remove the belt, remove the 2 bolts, then the 2 wires. I think one wire unplugs, the other has a nut holding it. The belt tensioner is more or less under the alternator (4.0 engine) & is released with a ” square drive ratchet or bar inserted into the square hole. Loosen the tension by pushing the bar to the right & slide the belt off the alternator pulley, then let the tensioner back slowly until it stops. Make sure you have a diagram of the belt routing before removing it in case it comes off some of the other pulleys.
Rubi4MyMrs is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 04:21 PM   #11
MountainMan864
Registered User
1999 TJ Wrangler 
 
Join Date: May 2008
Location: Spartanburg, SC
Posts: 3,659
My cd player lights kept going on and off. My headlights seemed dimmer. It was also slow to start. Maybe I just need to clean my battery terminals. The battery guage/volt meter guage was reading about on 9 and it usually reads above 14. Then after a second of the jeep running the guage would drop to 0 and my check guages light would come on. Thats why I think my alternator is going on. I took my battery to autozone and they said my battery was fine. So it can only be the alternator right?
MountainMan864 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 04:26 PM   #12
mg2380
Registered User
2000 TJ Wrangler 
 
Join Date: Jun 2010
Location: Denver
Posts: 495
Quote:
Originally Posted by timberwolf0122 View Post
Here's my Durango Alternator swap thread, this should help you out.
http://www.jeepforum.com/forum/f9/du...tures-1063518/
This.
mg2380 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 04:55 PM   #13
MountainMan864
Registered User
1999 TJ Wrangler 
 
Join Date: May 2008
Location: Spartanburg, SC
Posts: 3,659
Decent write-up but ill stick to something cheaper and oem. Just gonna have my alternator rebuilt for 60 bucks instead of shelling out twice that.
MountainMan864 is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 06:25 PM   #14
JBTJ
JEEPer For Life
 
JBTJ's Avatar
2001 TJ Wrangler 
 
Join Date: Mar 2006
Location: Dallas, Texas
Posts: 10,228
You descibed two different problems in your post. Your problem with slow to start I'd think is your battery, as the alternator hasn't even come into play at this point. But, everything else you described does sound like the alternator or a poor ground. What other problems are you having that makes you want to get rid of it? Alternators go bad no big deal. You can take it off and have it checked as well. Should take you 5 minutes to get it off.
JBTJ is offline   Reply With Quote Quick reply to this message
Unread 09-19-2011, 06:55 PM   #15
mracoker
Registered User
 
Join Date: Jul 2011
Location: elberfeld, IN
Posts: 141
Quote:
Originally Posted by Unlimited04 View Post
gawd no. they have just enough information to get you in trouble.

get a Factory Service Manual. if you plan to work on your jeep, you'll need one.
You are correct, I took your advice and bought a pdf version of the service manual and its way better than Haynes! How did I got this far without? I'm Glad I posted that or I would have never know

I just have to bring my laptop in the garage now and try not to get it too dirty!
mracoker is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.