which alternator - 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 11-13-2008, 05:21 AM
Registered User
 
Join Date: Oct 2007
Location: garland, texas
Posts: 60
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
which alternator

What are the pros and cons of three wire vs one wire alternators? My '38 Pontiac resto rod will have a 389 with points distributor, and down the road power accessories and a/c. Which type and ampherage will serve me best? I can turn nuts and bolts but don't speak electrical.

Also what about coil, voltage regulator etc. Do they need to be matched or any certain type?

Thanks in advance!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-13-2008, 06:34 AM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: Espaņa Right Coast
Age: 63
Posts: 3,238
Wiki Edits: 0

Thanks: 85
Thanked 67 Times in 64 Posts
You can read about the pros and cons of one wire versus three
here at MadElectrical.com
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-13-2008, 09:17 AM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,837
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
Three wire, no doubt about it IMHO, minimum 100 amp. As far as coil, just get a high quality one from NAPA or Car Quest. Do not get a house brand from Auto Zone or Orielly. The voltage regulator will be integral to the alternator if you go with a GM.

Vince
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-13-2008, 10:38 AM
Registered User
 
Last wiki edit: Wheelbase database Last photo:
Join Date: Jan 2007
Location: Virginia
Posts: 3,504
Wiki Edits: 1

Thanks: 6
Thanked 143 Times in 130 Posts
Quote:
Originally Posted by 302 Z28
Three wire, no doubt about it IMHO, minimum 100 amp. As far as coil, just get a high quality one from NAPA or Car Quest. Do not get a house brand from Auto Zone or Orielly. The voltage regulator will be integral to the alternator if you go with a GM.

Vince
If one wire alternators were so great, the factories would have gone that way just to save a few cents of copper per car. There's a reason why they didn't.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-13-2008, 06:52 PM
Registered User
 
Join Date: Nov 2008
Location: Portland Oregon
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Vince said it all. Use a GM 3 wire. 1 large 8-10ga wire, usually red, to battery from the output post on alternator, the clip will usually be a small white and a larger red. The larger red wire jump over to the alt output post with the 8-10ga that goes to battery, and hook the white smaller ga wire to the ignition switch "on" side, this turns the alternator on/off. It is also called the "exciter" lead. This is the basic GM system. There may be other positions you can use for the alternator to sense Battery charge which determines when the regulator is on or off.
As far as alternator size, you should base it on your equipment installed. If you plan on using a high power stereo system, high power lights, winch, or any other high amp drawing options, then you might want to consider the 100 amp alt. A/C and basic other functions should be fine with a standard 67amp. these are some considerations for you to determine prior to purchasing your alternator. You'll find 100 ampers can get kind of spendy as opposed to the standard 67 or so which are readily available. Regulators are built in to the alternators so nothing additional to buy. Resetable circuit breakers are a nice feature to install for additional protection. A 50amp breaker should work fine for a 67 amp alternator as the alternator will hardly ever output its full value if you keep a properly charged Battery. They trip out and come back after cooling off which will give you time to investigate a problem without frying your wiring. Just a suggestion. Hope this helps. I have wired a bunch of rods and Motorhomes this way without error or problems.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-13-2008, 07:30 PM
Registered User
 
Join Date: Aug 2006
Location: Alexandria, VA
Posts: 1,746
Wiki Edits: 0

Thanks: 4
Thanked 63 Times in 61 Posts
Two very easy to find alternators are the GM 10si (up to 65 amps) and 12si (up to 94 amps) with standard GM 3 wire harness. They both use the same brackets, and are usually very similar in price. With a 12si you should use an 8 gauge charge wire, but you can get by with a 10 gauge wire on the 10si.

This site has some good info on alternators.
http://www.extreme4wheelin.com/tech/...ators/tech.htm

Bruce
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-14-2008, 06:36 AM
Registered User
 
Join Date: Oct 2007
Location: garland, texas
Posts: 60
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks guys! Great advise, great forum.
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
Alternator not aligned, where'd I go wrong. Pics included bubbahotep Engine 3 09-17-2008 06:33 PM
How do I wire a 3 wire alternator when I used to have a 1 wire alternator??? billsbird Electrical 7 09-05-2007 09:01 AM
another frustrating alternator problem darom Electrical 13 04-09-2006 11:09 AM
alternator wire hanging in mid air?! pcoghlan Electrical 11 03-21-2006 02:47 PM
alternator problems woodmanscott@hotmail Electrical 7 01-18-2006 05:06 AM


All times are GMT -6. The time now is 11:29 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.