Alternator Wiring and Voltage Problem - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old Mar 11th, 08, 11:04 PM Thread Starter
 
Join Date: Apr 2007
Posts: 9
Alternator Wiring and Voltage Problem

Before i post this, let me say that i read every thread i could find on 67-69 camaros with alternator problems. None of them actually resovled the problem i'm having. .... so here it goes.

Battery drains over a period 3-5 days of infrequent driving. The battery measures 12.6 volts from terminal to terminal. From the negative Bat Terminal to the Alternator Positive post i get 12.55 volts. I also get 12.55 volts at the Alternator case. This is all very good resistance delta.

BUT - when i measure Neg Bat Terminal to the connector on the back of the alternator (two prongs), or the Positive Bat Terminal to the two prongs i get a Voltage of -9volts or +9 volts. . I think this is the problem... i'm missing 3 volts? This is all when the vehicle is off as well as running. That's the other wrinkle. when the car is running at 2k RPM my new alternator is only putting out 9Vs back to the battery. Could this be as simple as i have the two prongs wires reversed?


It's a new alternator. I've also traced the wires from the Alternator plugs to the fan and they have no obvious shorts. What the heck?

Thanks in advance for helping me.
69 z28 Orange is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old Mar 12th, 08, 04:03 AM
Senior Tech
 
Join Date: Dec 2001
Location: Fairfield, CA
Posts: 6,246
Re: Alternator Wiring and Voltage Problem

The case of the alternator is at 12+ volts? I think this should be at engine block potential, essentially zero volts.
onovakind67 is offline  
post #3 of 5 (permalink) Old Mar 12th, 08, 04:30 AM
Gold Lifetime Member
Jim
 
Join Date: Dec 1999
Location: Yorkville, Illinois USA
Posts: 22,121
Re: Alternator Wiring and Voltage Problem

In the basics sticky at the top of electrical, there is an article on troubleshooting this system, here's a direct link https://www.camaros.net/forums/showthread.php?t=77994

All the proper voltage readings are in the article.

As for the 2 prongs... the blue wire should be on the right, looking at the back of the alternator.





To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
New website for my vert is coming together. Do ya like the slide show on the home page?
JimM is offline  
 
post #4 of 5 (permalink) Old Mar 12th, 08, 07:22 AM Thread Starter
 
Join Date: Apr 2007
Posts: 9
Re: Alternator Wiring and Voltage Problem

thx. and i'll read the article.

and does the blue wire on the right go to the fan next? My car has been rewired and does not have original colors, so i'm dealing with all kinds of a color complexity.
69 z28 Orange is offline  
post #5 of 5 (permalink) Old Mar 12th, 08, 08:54 AM
Gold Lifetime Member
Jim
 
Join Date: Dec 1999
Location: Yorkville, Illinois USA
Posts: 22,121
Re: Alternator Wiring and Voltage Problem

Fan? We're gonna need more details... particularly as far as how stock your car is.
69 Camaros have a mechanical fan, it has no wires.
69 Camaros have an external regulator. The blue and white wires from the alternator go to the top 2 pins of this regulator.

If your camaro has an electric fan, it's wiring should go no where near the small blue and white wires from the alternator.

If your Camaro has been converted to an internal regulated alternator, the info I've given may not be correct.





To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
New website for my vert is coming together. Do ya like the slide show on the home page?
JimM is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user 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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

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