Alternator wiring - 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 03-12-2011, 11:36 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 40
Posts: 5,148
Wiki Edits: 16

Thanks: 0
Thanked 4 Times in 4 Posts
Alternator wiring

So, long story short:

My buddy has a show/ski boat with a 351W in it. The externally regulated alternator died. Replacing it with a reman was going to mean $220 and a week to order it. In the meantime, I happen to have an alternator from a 2001 chevy pickup that actually is a direct bolt in.

It has a 4-pin plug on it - the one with one large pin and three little pins. According to the wiring diagram, the only ones used are the two in the middle - one gets switched power and the other goes to the gauge/warning light.

So... with everything mounted I thought I would test some stuff out. I took the belt off, hooked up the battery to the main lug on the alternator, and spun it with a drill. (hoping it would self-energize). Alternator free-wheeled offering no resistance and voltage remained at 11.9v. With the drill spinning, I gave 12v to the appropriate contact and it almost immediately bogged down and.... still 11.9v. Thinking that my 2000 RPM drill wasn't enough, I put the belt on and started the engine. Given the size of the alternator pulley and the crank pulley, it probably spun to 3-4000 RPM and still 11.9v on the multimeter.

I verified wiring on the donor truck, and keep in mind that this was producing 14.4v in the truck literally two days before.

How do I properly wire this alternator? (and by the way... don't worry about the marine alternator... this is a show boat with an exposed engine above the deck)

    Advertisement

Last edited by curtis73; 03-12-2011 at 11:41 PM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-13-2011, 12:13 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
Look thru these links, may help: http://www.madelectrical.com/electrical-tech.shtml
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-13-2011, 04:39 AM
EOD Guy's Avatar
Registered User
 
Last photo:
Join Date: Aug 2010
Location: Alabama
Posts: 2,056
Wiki Edits: 0

Thanks: 1
Thanked 132 Times in 123 Posts
This might help
Attached Thumbnails
Click image for larger version

Name:	normal_GM_CS130_PLIS-3.jpg
Views:	177
Size:	28.2 KB
ID:	53537  
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-13-2011, 08:15 AM
Registered User
 
Join Date: Aug 2006
Location: Alexandria, VA
Posts: 1,757
Wiki Edits: 0

Thanks: 4
Thanked 66 Times in 64 Posts
When you connected 12 volts to the L terminal (dash light), did you put either a light or a 35-350 ohm resistor between the wire and the 12 volt source. The CS alternator will not operate properly if there is no resistor or light in the circuit.

This link has some easy to understand CS 130 wiring information.
http://www.scribd.com/doc/23641349/S...co-Remy-CS-130

Bruce
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-14-2011, 12:08 AM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 40
Posts: 5,148
Wiki Edits: 16

Thanks: 0
Thanked 4 Times in 4 Posts
I had connected 12v individually to L and I, both bogged down the alternator but didn't make any more juice. I now have the 12v switched on I and it seems to be working... kinda.

I fully charged the battery overnight last night. Today it showed 12.6v. I ran the boat for about 6 hours today trolling (caught some nice white bass and largemouth, too) and the Amp gauge showed that it was charging a couple amps. But two different volt meters confirm 12.3 at the battery while running.

The boat kept a charge all day and started up just fine every time, but I just don't understand why its not putting out the same 14.4 as it was on the truck just a few days ago.

For now, its working. Whether or not its working RIGHT remains to be seen, but I appreciate the help guys.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-03-2011, 09:10 AM
Ground zero's Avatar
Engineering Dept
 
Join Date: Sep 2010
Location: Cebu,Philippines
Age: 46
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I've been working on alternators a quite sometime already,,,usually if voltage drops below 12v even at high rpms,,,this indicates an open or defective diode in it,,,a perfect working rectifier ( set of diodes ) can produce 13.0v+ @ 750rpm...hope this helps,,,
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-03-2011, 05:56 PM
Member
 

Last journal entry: JB's 37 Pickup
Last photo:
Join Date: Oct 2002
Location: Smoky Mountains
Age: 76
Posts: 2,358
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Automotive alternators and inboard or inboard out drive motors don't mix. Because of the potential explosive fumes in the bilges of these units, special spark arresting alternators are used, thus the very high price. I would not take the chance, but spend the bucks and wait for it to arrive. A pleasure craft does not need to turn into a death trap.

Trees
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wiring alternator 75GMCman Engine 5 12-16-2008 10:48 PM
Alternator wiring larry bellach Electrical 4 05-20-2006 05:19 PM
Alternator Wiring Randy B Electrical 4 09-06-2005 05:47 PM
Alternator wiring help plz onecoomofo Electrical 8 03-30-2004 09:31 AM
alternator wiring screamin340 Electrical 2 01-16-2004 01:43 PM


All times are GMT -6. The time now is 12:07 PM.


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.