Alternator Wiring - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old Jan 11th, 12, 12:44 PM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Alternator Wiring

The car is a 69' with a 396. The alternator and regulator appear to be wired as stock. My alternator has the heavy red wire off one post, a black wire off the other post going to the neg battery terminal and the blue and white wire from the plug off the back. The white wire has been disconnected from the alternator and the VR. The VR appears to be the original style. My question is why would the white wire be disconnected on both ends, what is its function? The car is being charged.
jessielee is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old Jan 11th, 12, 02:22 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,650
Garage
Re: Alternator Wiring

The red wire is the power supply, BATT, and is used to supply power for the electrical system and recharge the battery when alt is running.
Black wire is probably connected to an alt case non-insulated stud and goes to neg post to place the alt case and battery on the same ground plane/reference level.
Blue wire is field supply telling alt to charge.
White wire is field return for energizing field relay turning off the GEN light in instrument cluster as ign voltage is supplied to the other side of GEN light.

Does GEN come on with ign key on, engine off?
Why it would be disconnected, I don't know, unless GEN bulb is burned out or the car has console gauges then GEN was chosen not used by previous owner(s).

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.
Everett#2390 is offline  
post #3 of 17 (permalink) Old Jan 11th, 12, 02:35 PM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Re: Alternator Wiring

I do not believe the GEN light comes on at all.
jessielee is offline  
 
post #4 of 17 (permalink) Old Jan 12th, 12, 02:46 AM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Re: Alternator Wiring

Quote:
Originally Posted by Everett#2390 View Post
unless GEN bulb is burned out or the car has console gauges then GEN was chosen not used by previous owner(s).
Why would a burnt out GEN bulb justify disconnecting the white wire and what effect would that have on the charging system? The car does not have console gauges.
jessielee is offline  
post #5 of 17 (permalink) Old Jan 12th, 12, 03:15 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,650
Garage
Re: Alternator Wiring

GM designed a parallel path from the ign sw to VR around the GEN bulb so in case the bulb did burn out, the charging system still works.
The parallel paths are: 1. wire from ign sw to bulb to VR; 2. Brown/white of smaller gauge wire from ign sw to VR, actually both go to firewall connection, then single wire to VR.
Why the disconnected white wires, I have not a clue.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.
Everett#2390 is offline  
post #6 of 17 (permalink) Old Jan 12th, 12, 03:54 AM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Re: Alternator Wiring

If I wanted to switch to an alternator with an internal regulator, which one would I need?
jessielee is offline  
post #7 of 17 (permalink) Old Jan 12th, 12, 06:21 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,650
Garage
Re: Alternator Wiring

You have three to chose from:
10SI
12SI
CS130 series, maybe four choices,
CS144 series - powers your house........

The 10 &12 are the same install, 10SI puts out 20 amps less than a 12SI, both both hook up the same in the conversion:
On the VR connector, jumper the two inside terminals together and jumper the two outside terminals. AT the alt connector, blue wire to '1' terminal and white to '2' terminal - just the reverse of the external reg'd alt connector in your hand.

CS Series is mount and wire the brown wire in car harness to 'L' terminal of alt connector to extinguish the GEN light after you replace it.

Of course, with all alts, red wire to BATT stud. If all heavy electronics is added in the car and power is from positve battery clamp, you mshould run a new min 8 AWG wire from alt BATT stud to battery pos post.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.
Everett#2390 is offline  
post #8 of 17 (permalink) Old Jan 12th, 12, 08:00 AM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Re: Alternator Wiring

Thanks for the help. One last question, currently my white wire is disconnected at both ends, isn't this wire needed to be in place for the alternator to charge?
jessielee is offline  
post #9 of 17 (permalink) Old Jan 12th, 12, 08:41 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,650
Garage
Re: Alternator Wiring

Apparently, not necessary in your application.
It's only use is to energize the field relay in the VR thus sending battery voltage to the other side of the GEN light once the alt is running to turn off the light.
For something to do, hook up the white wire and tell us what happens.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.
Everett#2390 is offline  
post #10 of 17 (permalink) Old Jan 12th, 12, 09:15 AM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Re: Alternator Wiring

In reading through the forums for converting to a 10SI or 12SI, I have found that those alternators need the resistance from the GEN light to activate the alternator. Is that correct or am I misreading it? Apparently my stock set-up does not need the GEN light.
jessielee is offline  
post #11 of 17 (permalink) Old Jan 12th, 12, 01:10 PM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Re: Alternator Wiring

Made some progress. Reconnected the wire at the alternator and regulator. Turned key on but no GEN light. Started engine and noticed the regulator buzzing at low rpm. Increased rpm's and buzzing stopped. Took a closer look and noticed GEN bulb not installed. Put new bulb in and it would light while the reg was buzzing. Replaced reg with new one and the buzzing is gone and the light works as it should but voltage seems a little low at around 13 volts while running. The bulb socket is a mess. Someone obviously had problems with it in the past. The brown wire to the GEN socket was spliced with a wire nut. How hard is it to change that entire light cluster. Ther are alot of wires going to it.
jessielee is offline  
post #12 of 17 (permalink) Old Jan 12th, 12, 06:17 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,650
Garage
Re: Alternator Wiring

The inst cluster itself is not too bad, speedo cable, and connector plugged into the back.
Four screws on the interior side and a short ground strap at the top. Be sure to reconnect ground strap upon installation as without it, strange things happen.

As I suggested, there is a wire from ign sw to one side of GEN light and a brown/white small gauge wire, approx 10 ohms, to the firewall connector.
The other side of GEN is a single brown wire to the same firewall terminal.

Having a 13 volt recharge may show a low charged battery, might add an external charge on it for an afternoon and see what happens later.

Yes, internal reg'd alts need an excite voltage, usually from the ign sw.
Sense wire would be typically the horn relay buss bar or, the BAT spade on the fuse panel.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.
Everett#2390 is offline  
post #13 of 17 (permalink) Old Jan 13th, 12, 06:51 AM
Gold Lifetime Member
Jeff
 
yellow69RS's Avatar
 
Join Date: Jul 2007
Location: Aurora, IL
Posts: 5,005
Send a message via Yahoo to yellow69RS
Re: Alternator Wiring

Are the terminals on your exsisting alternator like this l l or like this - -?
If they are up and down it's externally regulated. if across it's internal. I really wonder if it's not internal regulated one wire alternator already.

Jeff
yellow69RS is offline  
post #14 of 17 (permalink) Old Jan 13th, 12, 07:10 AM Thread Starter
Tech Team
Joe
 
Join Date: Dec 2011
Location: NY
Posts: 56
Re: Alternator Wiring

It's definetely externally regulated. I am in the process of changing over to internal. The hard part is going to be fixing the hack job that was done to the generator lamp socket.

Thanks for all the help!
jessielee is offline  
post #15 of 17 (permalink) Old Jan 13th, 12, 11:31 AM
Admin/Super Moderator
Brian
 
69-Pace's Avatar
 
Join Date: Jun 2010
Location: Connecticut USA
Posts: 12,509
Garage
Re: Alternator Wiring

Well the GEN light socket and harness are available if you want to drop in OEM style.

Everett am I right to assume that the white wire was the signal to the VR to stop charging? If so I would suspect they had some voltage issues, and the fix was to have the alternator field live all the time - always producing power, with the white wire disconnected, the GEN light was disabled to override the GEN light telling you there was a overcharging problem. But maybe I'm wrong it is after all Friday the 13th.


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

1969 Z11 Pace Car - L48 350cid/300hp - 4 Speed Muncie 12 bolt rear.

Super Moderator Team Camaro
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
to send me a private message
69-Pace 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