This will take you to the main site where there is history, technical information and other information on these cars.
This takes you back to the main page of the forums.
This is the control panel to change your password, information and preferences on this message board.
Click here if your lost your password or need to register on this message board. You must be a registered user to post. Registration is free.
Search this board for information you need.
Click here to buy cool Squarebirds mechandise.
Click here to support For $20 annually receive 20mBytes webspace, a Squarebirds e-mail address and member's icon on the message board.
Old 09-07-2018, 09:36 AM
ssj335's Avatar
ssj335 ssj335 is offline
Join Date: Jul 14 2018
Posts: 265
ssj335 is on a distinguished road
Default Voltage Regulator Test

I had a mechanic replace my VR as a "bad part" but I suspect it is fine. I still have it. Is there a way to test it out to confirm it is good/bad? Or would it require it being hooked up to a car and really not worth the effort? Either way I will hold onto it as I suspect it may be ok.
Reply With Quote
Old 09-07-2018, 01:41 PM
jopizz's Avatar
jopizz jopizz is online now
Excellent Auto Mechanic for over 40 years.
Join Date: Nov 23 2009
Posts: 5,685
jopizz is on a distinguished road

It's difficult to test the regulator without it being on the car. However I also think it's probably ok. Going by the picture of your engine compartment it appears it may be an original Fomoco regulator. If so it's worth something even if it's just for the cover. It may also be an aftermarket regulator with a repro sticker put on. Either way I would keep it.

John Pizzi - Squarebirds Administrator
1959 Convertible

Thunderbird Registry #36223 856-779-9695
Reply With Quote
Old 09-07-2018, 04:24 PM
simplyconnected's Avatar
simplyconnected simplyconnected is offline
Slow Typist
Join Date: May 26 2009
Posts: 7,633
simplyconnected is on a distinguished road

Notice the back of your regulator has two long resistors. They are extremely fragile because they are brittle. When mounted, the resistors are protected but many are destroyed when handled.

I got a kick out of a YouTube video where you can hear the novice mechanic crack one of these on camera. He had the same idea of testing the regulator on a bench but wasn't careful.

YES, regulators can be tested but you need to know a few things:
  • What are the resistor values? Are the resistors open?
  • Are the solder connections solid? <--VERY important
  • Have the contact points been dressed and properly aligned?
  • Are the three coils open/shorted or do they pull-in their armatures?

OEM regulators are all mechanical. They work with either polarity because there are no solid state components.
I bench test mine using a headlamp for a field load and a battery that is partially drained. If you have questions regarding their operation, please ask. - Dave
My latest project:
CLICK HERE to see my custom hydraulic roller 390 FE build.

"We've got to pause and ask ourselves: How much clean air do we need?"
--Lee Iacocca
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 11:08 PM.

Driving, racing or working on cars can be hazardous. The procedures and advice on this website including the message board are opinion only. and its webmasters and contributors do not guarantee the correctness of the advice and procedures. The and its webmasters assume no liability for any damage, fines, punishment, injury or death resulting from following these procedures or advice. If you do not have the skills or tools to repair your car, please consult a professional. By using this site you agree to hold harmless the, its authors and its webmasters from any resulting claim and costs that may occur from using the information found on this site.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Any submissions to this site and any post on this site becomes property of . The webmasters reserve the right to edit and modify any submissions to this site. All material on this is site is copyrighted by the Reproduction by any means other than for personal use is strictly prohibited. Permission to use material on this site can be obtained by contacting the webmasters. Copyright 2002-2016 by