Bypassing external voltage regulator - 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 08-04-2012, 10:52 AM
jseabolt's Avatar
Registered User
 
Last photo:
Join Date: Nov 2011
Location: Kingsport, TN
Age: 43
Posts: 75
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Bypassing external voltage regulator

If you had an old car without a wiring diagram, 50 Caddy or whatever with an externally mounted voltage regulator and you wanted to install a modern 12 volt alternator (say the generic AC Delco with internal regulator installed on 70 GM cars) how would you go about bypassing the external regulator if you didn't have a wiring diagram?

My 68 Ford Fairlane has an alternator but an external regulator. It has a four wire connector going to the regulator.

If the car has a generator, it should not have a rectifier (since it's already producing DC voltage) built into the regualtor. If it has an alternator, the regulator should have a rectifier built into it.

I'm assuming the first thing is to test the each wire with the car running and see what happens.

Say if this is on my 68 Ford Fairlane:

1) If one wire should give some crazy reading that should indicate it's AC current (input).
2) If one wire gives a steady voltage reading, that wire should be the (DC output). This wire should goto either the fusebox or back to the battery.
3) One wire probably goes to the battery light in the gauge cluster.
4) I have no idea what the other wire goes to. Ground perhaps?

I actually have a wiring diagram for this vehicle but that's not really the one in question.

I would think if you installed a 12 volt alternator w/internal regulator, the best way to wire it up would be to run a wire off the back of the alternator directly to the battery or post on the starter or starter solenoid.

Then disconnect all wires at the regulator. Hook the battery back up then start the car (if it starts) and see what happens. See if the voltage at the battery increases and what circuits work.

Maybe tie the DC output wire coming off the regulator to the alternator?

Where would you go from there?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-04-2012, 01:17 PM
Registered User
 
Last photo:
Join Date: Apr 2012
Posts: 145
Wiki Edits: 0

Thanks: 1
Thanked 12 Times in 12 Posts
If you use a GM 1-wire, just connect the red Bat wire from the alternator to the battery (or horn relay as in the case of a Corvette) and make sure the case is grounded. You can also run a ground wire to the case as back-up.

Just disconnect the other plug/wires (the Field and Lighting Boost) at the alternator, and let it hang or cut the plug off the wires and tuck them back into the loom.

On a GM the plug on the voltage regulator can remain or you can unplug it. In the case of a Corvette (the basis of my experience), there is a "condensor" attached at the voltage regulator that you would disconnect if you pull this plug off the regulator. But the condensor is only for radio noise suppression and doesn't affect anything else and you may not have it.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-04-2012, 08:26 PM
Cape Cod Bob's Avatar
Registered User
 
Last wiki edit: How to title a hot rod Last photo:
Join Date: Jul 2007
Location: MA
Posts: 1,141
Wiki Edits: 1

Thanks: 0
Thanked 30 Times in 20 Posts
Converting From a 6 to 12 Volt Electrical System
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:
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
external voltage regulator conversion to a new alternator/regulator in my 1970 chevel kamutr Electrical 6 06-07-2012 07:47 PM
Ford External Voltage Reg Help Needed retiredblue Electrical 2 01-29-2011 11:33 AM
Convert External Regulator To Internal Regulator 83F150 Electrical 1 05-18-2008 09:10 AM
external to internal voltage regulator TASHAN Electrical 2 09-04-2005 11:13 PM
External Voltage Regulator Wiring dsmith1279 Electrical 1 12-17-2004 10:33 AM


All times are GMT -6. The time now is 10:49 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.