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 10-10-2017, 04:10 AM
simplyconnected's Avatar
simplyconnected simplyconnected is offline
Slow Typist
Join Date: May 26 2009
Posts: 7,632
simplyconnected is on a distinguished road
Default OEM Voltage Regulator operation

I promised johng I would write up the sequence of how our original voltage regulators work.

The most important part to check is the current path through the resistors. Here's why...

When we first turn the key, the voltage regulator is disconnected from the battery. That means the Cutout Relay must be energized strictly by generator power.

As the generator starts to produce power, the armature (A) feeds the generator's field (F) through normally closed contacts. The coils and resistor (R2) are connected to each other via ground. Without the resistors, current for the cutout relay coil would not have a completed path. Therefore it would never connect the battery to the generator.

Check this out and give the sequence lots of time to better understand each phase of operation:

So why is this so important? Troubleshooting a 'dead' voltage regulator is simple if you understand the current paths, especially while the cutout relay is NOT energized.

Look at the normally closed contacts from the overcurrent and overvoltage relays. If either are dirty or open, the field only gets enough current passing through the top resistor to sustain the cutout relay coil IF it's already closed. It's not enough to initially pull the cutout relay in.

Battery charging can only happen when the cutout relay is energized. All the generator's power goes through this one contact. The other two control the field.

I'm sure some of you will have questions. - 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 02:57 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