Alternator Question - Page 2 -
LinkBack Thread Tools
post #16 of 17 Old 06-09-2010, 05:48 AM
Web Wheeler
1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit
Posts: 24,647
Yes, anything with the ECU SBEC1 will have the engine controller in the engine compartment and will have the ECU controlling charge. The answer to the second statement about the guage is a litle more involved. You primary vehicle supply for the power when the vehicle is running is the alternator, not the battery. The reason the alternators went to extewrnally regulated is because the control circuits changes and became digital. The output to control the power is actually a modulated signal that varies with load. The reason the circuit was put in the controller was because the controller had inputs for fuel and timing. This gave the controller the ability to decrease and increase the fuel and timing with the load requirements and give better milage and faster response to demand. As for the voltage reading question. Where you measure from as far as a point in the system is not really as important as long as the voltage drop for the wiring is compensated for in the guages reading. There is an adjustment writeup someone posted. As for the controller and the 5 and 8Vdc power supplies. They are regulated by 2 internal voltage regulators. The voltage regualtors are spec'd not to vary the output voltages down to 9Vdc and the controller itself is suppose to function as a system down to 6Vdc. I wouldnt recommend doing it for a extended length of time but that is design standard. I hope I answered your questions.

Que89YJ is offline  
Sponsored Links
post #17 of 17 Old 06-09-2010, 09:02 PM
Registered User
1990 YJ Wrangler 
Join Date: Jan 2009
Location: NA
Posts: 1,623
Originally Posted by sentinal02 View Post
check out the diagram attached. pin 20 on the PCM drives the field of the alt. the alt still rectifies the output as usual of course, but the regulator has been moved to the computer. what really sucks is when the regulator goes, the whole computer needs replacing. like you said, it's a round about way of doing things and it does make you wonder what the advantage is.
Amazing. Thanks.
plym49 is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Alternator question lil-jmart13 Wrangler General Discussion 2 10-10-2009 01:59 PM
Alternator Question stoutameyer YJ Wrangler Technical Forum 3 10-08-2008 03:22 PM
98 alternator question jac1 TJ Wrangler Technical Forum 11 07-07-2007 02:53 PM
alternator question brundz YJ Wrangler Technical Forum 3 01-11-2006 02:13 PM
Alternator question 2001 quickslver TJ Wrangler Technical Forum 4 06-09-2005 08:35 PM

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 Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome