Alternator ? - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-16-2007, 03:43 AM
Compression Ignition Addict
 

Join Date: Sep 2007
Location: ON THE BOARDER(NORTH)
Posts: 384
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Question Alternator ?

Its been a while since i've messed with a alt. Does this sound right to u ? The voltage at the batt. and alt. at idle is 12.56. @ 2500 rpms its 13.60. I just replaced the batts. 2 days ago, the other ones were on their way out and the plowing season is here. to me it seems the idle volts should be higher. Thanks
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-16-2007, 11:49 AM
Compression Ignition Addict
 

Join Date: Dec 2006
Location: Charleston SC
Posts: 469
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
When you replaced the Batts, did you use a charger to fully charge them? Should always do this with new batts. I haven't ever seen voltage increase due to an increase in RPMs. Thats my limited experience though. I have seen a battery voltage of
14.something at idle so it sounds a bit low to me. Maybe a tech will chime in with more reliable info for you. If it was me, I would take it to napa or schucks or wherever and have them do the alternator test. They'll do it for free. Make sure your batteries are charged before you take it to them if you do. Low batts give the tester a fit, from what I was told. Hope this helps. Let us know what you find out.
Reply With Quote Quick reply to this message
  #3  
Old 11-16-2007, 12:05 PM
Compression Ignition Addict
 

Join Date: Nov 2006
Location: Mesa, Az
Posts: 521
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Make sure your glow plugs aren't active. That would cause low voltage. Other than that. I would take the altenator and have it checked at an auto parts store. Sounds low to me.
Reply With Quote Quick reply to this message
  #4  
Old 11-16-2007, 12:14 PM
duct tape & zip ties

 

Join Date: Jul 2006
Location: Willis, MI
Posts: 10,759
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Send a message via Yahoo to bigcountrysg
If your glowplugs are not being cycled when you checked out your charging system. Then your alternator is weak and will need to be changed soon. Your weak batteries could have damaged the alternator by over working it. Alternator output is around 14 volts. If your getting a low reading 12.5 volts at idle then your alternator is on its way out the door too.
Reply With Quote Quick reply to this message
  #5  
Old 11-16-2007, 12:28 PM
Member
 

Join Date: Jul 2006
Location: Minnesota
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Alternators will only output their rated current when cold. Also when you motor is at idle the alternator will output even less. I know my 05 has a 130 amp alternator, when hot and at an idle it may only output 25-35 amps.

To really verify your alternator you need a clamp on current meter on the main power line between the alt and the battery. If the current is less than 25 amps and you still have low voltage readings you most likely have a bad alternator. Also you should try and turn most of your accessories off, that blower fan can really suck a lot of juice.
Reply With Quote Quick reply to this message
  #6  
Old 11-16-2007, 03:24 PM
Compression Ignition Addict
 

Join Date: Sep 2007
Location: ON THE BOARDER(NORTH)
Posts: 384
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I'll have to go to Auto Zone, and have them test it. The dealer said its a 110 amp unit. That seems low too, Wrangler NW - Power Products these guys have a 150 amp for 400.00$ Its not listed on their site but I called. The stock one from Ford is 310.00$. Auto Zone has one for 230.00$ with a lifetime warrenty. Carquest was 186.00$ How would I know if the glow plugs were cycling? The light is not on ? Thanks for the replies

Last edited by Tree Killer; 11-16-2007 at 03:26 PM. Reason: more information
Reply With Quote Quick reply to this message
  #7  
Old 11-19-2007, 01:40 AM
Compression Ignition Addict
 

Join Date: Sep 2007
Location: ON THE BOARDER(NORTH)
Posts: 384
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
UPDATE

Took it Advance Parts, (Auto Zones tester was broke) @ idle it pushed 4.0 amps @ 2000rpms 16amps 13.30 Vs. anyone know how to test for the glow plug cycling thing?
Reply With Quote Quick reply to this message
  #8  
Old 11-19-2007, 06:00 AM
I don't know nuttin....

 

Join Date: Jul 2006
Location: Tuttle, OK
Posts: 17,160
Thanks: 1
Thanked 9 Times in 9 Posts
Feedback Score: 0 reviews
you GP weren't cycling more than likely.
You voltage regulator is fryed and you can get the alternator rebuilt at any starter/alternator shop for around 100.00
A week battery will cause this type of failure so its a good idea to always check your batteries before winter.
Reply With Quote Quick reply to this message
  #9  
Old 11-19-2007, 09:03 PM
Powerstroke.org Fanatic
 

Join Date: Sep 2007
Posts: 121
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
You need a new alternator dont bother rebuilding it just get a new one or a reman in the long run it will cheaper.
Reply With Quote Quick reply to this message
  #10  
Old 11-23-2007, 05:31 AM
Compression Ignition Addict
 

Join Date: Sep 2007
Location: ON THE BOARDER(NORTH)
Posts: 384
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Well I got a reman from Auto Zone, Lifetime warr. Advance was cheaper but the limted warr. scared me away, they will only replace it once. The new one is charging good 14.28 this morning. C YA
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum 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 email address for yourself.
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
Display Modes

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 On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 06:33 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors