Fixed alternator with hammer, what next? (4.7) - JeepForum.com

 
LinkBack Thread Tools
post #1 of 15 Old 05-01-2013, 07:25 AM Thread Starter
Double E
Web Wheeler
 
Double E's Avatar
2000 WJ 
 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 4,816
Fixed alternator with hammer, what next? (4.7)

Just turned over 170K.

On a recent 3 hour trip, my alt reading kept going lower & lower to the point that the check gauges light came on.
Knowing the alternator was suspect, I pulled over & left the engine running.

I tightened the batt cables to make sure it was pulling all juice it could to keep running & gave a whack to the top of alternator out of frustration with a tire iron. It instantly "righted" itself and the engine RPMs increased and the under hood light brightened. Inside, the alt needle was back to just under 14 and it stayed that way for the rest of the trip.

On the way back home, 2 days later it did the same thing and I fixed it again the same way.
My question: Is that "fix" I found a classic sign of the alt going bad or is there something else recommended like opening it up and cleaning it out. Is there a re-build kit recommended or is a newe one the only option?

Replace the belt while I'm in there, right?


'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
Double E is offline  
Sponsored Links
Advertisement
 
post #2 of 15 Old 05-01-2013, 07:51 AM
99WJ01TJ
Registered User
1999 WJ 
 
Join Date: Oct 2012
Location: Monroe
Posts: 602
Although the connection itself could be faulty (examine the connector, the pins inside it and the wiring closely for nicks,pinches,looseness,etc) Try wiggling the alt connector the next time the light comes on. Striking a failing alternator or starter sometimes nudges worn parts just enough for them to work for a while. With a alternator; the brushes are likely worn done and the blow jiggles them enough to connect. That's the problem with moving parts.....they wear out.
99WJ01TJ is offline  
post #3 of 15 Old 05-01-2013, 09:33 AM
berndog67
Registered User
2003 WJ 
 
Join Date: Nov 2011
Location: fort edward
Posts: 480
if u do replace it, make sure to get one for a 2004 durango 4.7L, and check the box and alt to be sure u got a 160 amp one, its a nice little upgrade from the 136 amp one we have in our wj's, and they are usually at least $20 cheaper than the wj ones!

2003 WJ Overland, 4.7HO, D30 & D44A (1 tons going in now!), RC Long Arm, lifted 4" Front 6" Rear, RC 2.2 4" Shocks, JKS track bar, custom hi-steer, 35" Procomp M/T's on JK rims, beefed up Overland rock rails, custom skids and dif gaurds, Rugged Ridge 8500 synthetic winch in custom hidden mount
berndog67 is offline  
post #4 of 15 Old 05-01-2013, 10:54 AM
lazyWJ
Registered User
2006 XK Commander 
 
Join Date: Feb 2013
Location: halifax
Posts: 828
My experience with the denso units used on older turbo/fwd dodges is that the armature often wears excessively, making rebuilding it (replacing brushes) a poor return on time and money invested. Not sure if these are similar, but for the money I'd buy a new one for a durango if you plan to keep the jeep a while.

2004 Imola BMW ZHP
2006 Commander Limited Hemi QD2
"Bought, Not Built"
lazyWJ is offline  
post #5 of 15 Old 05-01-2013, 08:24 PM
narnwv
Moderator
 
narnwv's Avatar
2000 WJ 
 
Join Date: Sep 2009
Location: Cross Lanes
Posts: 6,417
Quote:
Originally Posted by berndog67 View Post
if u do replace it, make sure to get one for a 2004 durango 4.7L, and check the box and alt to be sure u got a 160 amp one, its a nice little upgrade from the 136 amp one we have in our wj's, and they are usually at least $20 cheaper than the wj ones!
2005+ durango

~Aaron


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
narnwv is offline  
post #6 of 15 Old 05-02-2013, 06:51 AM
adolphhipster
Registered User
2000 WJ 
 
Join Date: Apr 2011
Location: Rocky Point
Posts: 495
2001 durango also
adolphhipster is offline  
post #7 of 15 Old 05-02-2013, 07:12 AM Thread Starter
Double E
Web Wheeler
 
Double E's Avatar
2000 WJ 
 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 4,816
Super...

The Durango unit bolts up, no modifications?

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
Double E is offline  
post #8 of 15 Old 05-02-2013, 07:18 AM
adolphhipster
Registered User
2000 WJ 
 
Join Date: Apr 2011
Location: Rocky Point
Posts: 495
The 05 does but there is a tab you may or may not have to cut off. I had to cut off because i drilled out the upper bolt because it was basically welded in the bracket.
adolphhipster is offline  
post #9 of 15 Old 05-03-2013, 06:59 AM Thread Starter
Double E
Web Wheeler
 
Double E's Avatar
2000 WJ 
 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 4,816
Done. The 2001 Durango unit bolted up perfectly.
The only modification was to the top connector (red wire) from the battery when I had to enlarge the hole of the wire connector to fit the larger post of the Durango alternator.

Cost $75 less than the Jeep spec unit and the Durango spec unit puts out 160 AMP compared to 134 with the OEM.

Anyone care to explain why this is so?
Also, is there any "down side" to a higher output alternator?

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
Double E is offline  
post #10 of 15 Old 05-03-2013, 07:11 AM
georged
Registered User
2004 WJ 
 
Join Date: Jul 2007
Location: central Florida
Posts: 743
Will the Durango unit fit and work on an 04 GCL 4.0?
georged is offline  
post #11 of 15 Old 05-03-2013, 12:00 PM Thread Starter
Double E
Web Wheeler
 
Double E's Avatar
2000 WJ 
 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 4,816
Well...the Durango never came with a 4.0

The Durango Alt unit I used was for a 4.7 and I asked the parts person to bring me a 2000 WJ Alt & the Durango Alt to look at side-by-side and we could see there was a match except for output rating.

Since the WJ 4.7 Alt is not a direct swap for the 4.0 Alt, I'd say no.

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
Double E is offline  
post #12 of 15 Old 05-03-2013, 12:34 PM
99WJ01TJ
Registered User
1999 WJ 
 
Join Date: Oct 2012
Location: Monroe
Posts: 602
Quote:
Originally Posted by Double E View Post
Well...the Durango never came with a 4.0

The Durango Alt unit I used was for a 4.7 and I asked the parts person to bring me a 2000 WJ Alt & the Durango Alt to look at side-by-side and we could see there was a match except for output rating.

Since the WJ 4.7 Alt is not a direct swap for the 4.0 Alt, I'd say no.
I say find one at a scrap yard and double check. I have a 01 tj I6 & I swapped a 160 amp alternator from a 02 4.7 Durango. Granted the alternator on the I6 wj are in a different location than on a tj......they are the same engine.
99WJ01TJ is offline  
post #13 of 15 Old 05-03-2013, 12:35 PM
adolphhipster
Registered User
2000 WJ 
 
Join Date: Apr 2011
Location: Rocky Point
Posts: 495
Durango alt works on a wj 4.0 direct fit.
adolphhipster is offline  
post #14 of 15 Old 05-03-2013, 12:43 PM Thread Starter
Double E
Web Wheeler
 
Double E's Avatar
2000 WJ 
 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 4,816
So if the Durango fits the WJ perfectly as I recently confirmed (2000WJ 4.7 & 2001 Durango 4.7)

...then the WJ 4.7 Alt is also a direct swap for the 4.0 WJ? (all years?)

Not arguing the point either way but want to prevent misunderstandings.

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
Double E is offline  
post #15 of 15 Old 05-03-2013, 12:48 PM
99WJ01TJ
Registered User
1999 WJ 
 
Join Date: Oct 2012
Location: Monroe
Posts: 602
Quote:
Originally Posted by Double E View Post
So if the Durango fits the WJ perfectly as I recently confirmed (2000WJ 4.7 & 2001 Durango 4.7)

...then the WJ 4.7 Alt is also a direct swap for the 4.0 WJ? (all years?)

Not arguing the point either way but want to prevent misunderstandings.
Correct, but with the Durango unit bring cheaper than a wj unit...it's a no brainer for those of us with tj's . I need to buy one for my 4.7 now too. My alternator is fine but I have lots of offroad lights that draw amperage
99WJ01TJ is offline  
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.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome