alternator problems - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-08-2007, 06:23 PM
woodmanscott@hotmail's Avatar
Registered User
 
Last photo:
Join Date: Dec 2005
Location: thomaston ga
Age: 40
Posts: 115
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
alternator problems

First i would like to say that i am saddened by doc's passing i only knew him here in the forums but he has helped me alot .. i have not been online so i am just seeing the post as of now ......



i am having problems with my alternator when i crank up the truck it takes a second for the alternator to kick in while you are waiting if you rev the engine the voltage goes up and down with the rpm but once it kicks in it hod 14 volts when i said it takes a second to kick in i meant more like 30 any ideas
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-08-2007, 07:41 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 56
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 89 Times in 84 Posts
What kind of alternator?

Two possibilities come to mind ...
1.) Some alternators require a voltage "signal" to excite them ... so perhaps a loose or corroded connector or wiring?
2.) Worn brushes ... and the springs can't push them far enough into the slip ring.

Yeah ... we all miss the Doc.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-09-2007, 03:59 AM
woodmanscott@hotmail's Avatar
Registered User
 
Last photo:
Join Date: Dec 2005
Location: thomaston ga
Age: 40
Posts: 115
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
alternator trouble

i believe it is a delco-remy and it is atleast 7 yrs old
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-09-2007, 02:33 PM
68NovaSS's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Working with chromed bolts
Last journal entry: New to me T-Bucket
Last photo:
Join Date: Sep 2002
Location: Tri-Cities, Washington
Age: 67
Posts: 5,151
Wiki Edits: 9

Thanks: 86
Thanked 122 Times in 114 Posts
If it's a one-wire alternator, as 66GMC says, they require 12-1500 rpms to activate the charge, after that they charge at idle and act like an externally regulated alternator.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-09-2007, 05:58 PM
woodmanscott@hotmail's Avatar
Registered User
 
Last photo:
Join Date: Dec 2005
Location: thomaston ga
Age: 40
Posts: 115
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
alternator

it has 3 wires going to alternator 4 if you count the main battery wire..it is on a 2000 gmc sonoma 4.3 v6 i read online where it says that he trucks computer controls the charging and if there was a trouble code when the alternator failed that it would have to be cleared before it would charge.. but i have checked the codes and a local shop and there are no codes not even any stored that pertain to the charging system when the alternator is charging it does great ... but i was just wondering if the lagging whne you first crank it means that the alternator is going out or if the computer is going out ?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-09-2007, 07:09 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 56
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 89 Times in 84 Posts
According to the WAI Catalog that truck should be using a Delco-Remy CS-130-D series alternator, that should look like this:



According to the "Bill of Materials", this is the
Votage Regulator ... which is where your 4-wire plug goes in.
Perhaps someone else will jump in here and explain what the "P-L-F-S" terminal technology means. (P = PCM, L = Light, F = Field, S = Stator?)

They also mention that this regulator is designed for a digital dash.

Based on what you were told about the alternator needing a "signal" from the PCM ... and what I believe those terminal ID's to be ... I would assume that a specified voltage (12V?) applied to the "P" terminal would "excite" the alternator.

Can anyone confirm or deny that?

It might be safest to either take it to a shop and have them diagnose it, or to remove that alternator from the vehicle and have it "bench-tested".

Last edited by 66GMC; 10-09-2007 at 07:17 PM.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-09-2007, 07:40 PM
woodmanscott@hotmail's Avatar
Registered User
 
Last photo:
Join Date: Dec 2005
Location: thomaston ga
Age: 40
Posts: 115
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
alternator

thanks for all the help i will take it and have it bench tested under load and see if it works correctly or not and let you know what i find
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 -6. The time now is 02:17 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.