perplexing charging issue- 84 Buick Regal T type - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old Aug 26th, 04, 12:02 AM Thread Starter
Senior Tech
 
Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305
Post

in the 3 months i've had the car, on 2 seperate occasions the alternator would just stop charging and i'd barely make it home before the car totally died.
then, i'd let it sit over night, and it would work fine again.
well, last sat night, it did it, and when i got home i started poking around with the test meter. it was down to 8.5 volts, and the alt was doing nothing. ok, easy fix i thought. threw in a different alt, no dice. converted it to a 100 amp CS130 alt i had laying around- nothing. the wire that activates the voltage regulator was dead. checked all the wiring for continuity- all zero ohms, checked the bulb in the dash- and it was, of course, good. unplugged the harness at the firewall- no corrosion of free play there, either.
all grounds are good, tried 3 different batteries, all positive connections are clean and dry.
that was saturday night- on sunday, it worked great, and i drove it to work monday-15 miles away- only to have the car almost die pulling into the parking lot with a dead battery again. 12 hours later, when i got off work, it started right up and all the lights were bright and it ran great all the way home.
so what am i not seeing here? ignition switch? everything else on the car works good, but i am paranoid about driving it anywhere. i hate problems that don't allow me to fix them..

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
novaderrik is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old Aug 26th, 04, 01:36 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,864
Garage
Post

A head scratcher for sure! On a 10SI & 12SI, as viewed from the rear, the left spade is for the bulb/voltmeter, the right spade is for the voltage sensing from a remote point.

This remote point comes from the ignition switch and has 12 volts on it with ign ON. Or you can tie the BAT terminal with the right spade.

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 Ö enjoy your next chapter.
Everett#2390 is offline  
post #3 of 7 (permalink) Old Aug 26th, 04, 09:30 AM Thread Starter
Senior Tech
 
Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305
Post

the big red wire on the plug is looped to the big terminal on the back of the alt from the factory- if it had not been, that would have been the first thing i tried. full battery power there.
something is causing the alternator to not get "powered up" from time to time...
on a side note, i had to wire the CS alternator different than the one in my Nova- i had to use a different wire in the plug to get it to work at all. on my Nova, i used the terminal that it shows in the tech reference section here- i think it was the second wire over from the big red wire on the plug. in the Buick, i had to use the one next to the big red wire to make it work. this is on the very same alternator that i took out of the Nova 2 weeks ago chasing a similar problem on that car- which turned out to be a bad connection that i made 5 years ago when i converted that to an internal regulated alt- so one would think the hookup would be the same.
truly weird indeed. i hate electrical gremlins.

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
novaderrik is offline  
 
post #4 of 7 (permalink) Old Aug 26th, 04, 10:40 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,864
Garage
Post

Hmmm..... I have a CS130 alt (OEM) on my dually and it has two wires plugged in/on it. One #8 red wire and a single wire on the plug for the voltmeter.

How much simpler can one get?

Unless there is a difference in conductivity from alternator case to neg battery post and/or BAT terminal the positive battery post, you got me.
Everett#2390 is offline  
post #5 of 7 (permalink) Old Aug 27th, 04, 07:05 AM Thread Starter
Senior Tech
 
Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305
Post

does anyone know how much voltage is supposed to come thru the little brown "idiot light" wire in the plg on the alternator? with the key on, it gets almost full battery power, but i thought there was supposed to be some resitance there or something like that?

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
novaderrik is offline  
post #6 of 7 (permalink) Old Aug 27th, 04, 08:18 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,864
Garage
Post

When no current is drawn/used/traveling, there will be full source voltage, battery voltage.

There should be some resistance, I think 35 ohms in parallel, its generally used for bleeding off voltage when turned off. Also, to provide a working alt in case the light bulb burns out.

I measured Buford's alt plug last night and between the neg battery post to each wire was battery voltage. However, potential difference across the pair was .04 volts DC. A definite difference. This is a 12SI alt.

With key on, alt off (not turning), 12 vdc goes to one side of the light. The alt being lower in potential, since its not working, bulb lights. As soon as alt fires up and starts changing/producing energy, alt supplies 12vdc to the other side of bulb, thus, light goes out.
Everett#2390 is offline  
post #7 of 7 (permalink) Old Aug 27th, 04, 09:34 PM Thread Starter
Senior Tech
 
Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305
Post

i figured it out- the harness that plugs into the back of the instrument cluster had a bad connection. kind of discovered it on accident when i was taking the dash apart to check the volt bulb again- set the cluster back in and started the car with my handy multimeter hooked up to the battery- 11.5 volts. got dismayed and ready to give up for the day to get other projects done, and started putting in the cluster screws while the car was idling- then the dome light got brighter all of a sudden and the meter read 14 volts. took the cluster back out and attacked the connections with a pencil erasers to clean the contacts and a little screwdriver to bend the pins up a bit for atighter fit.
since it worked, i went up to the Chev dealer and got a new plug for the alt, as i decided to leave the 100 amp CS alternator in there and the plug i was using was kind of crappy. that damn plug from GM was $26- but had leads a foot long and butt splice connectors with shrink tubing on them to put it in.

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
novaderrik 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