C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 General Discussion
Not Logged In! Login or Register!  Users Online: 13 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Volunteer Vette Products
VetteBookStore.com
Bair's Corvettes
CorvetteClothing.com
Mid America Motorworks

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
C3 SHARK
sharkc3
Featured Links
Chevrolet Corvette Restoration Guide


Buy Now
Corvette Magazine - $19.99 for 8 issues
Corvette Magazine
Only $19.99 for 8 issues


Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)


Corvette Fifty Years (Hardcover)
Corvette Fifty Years (Hardcover)


Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)
Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
6/22/14 12:58pm - Original Message: 'alternator'
Bags74Vette
Former Member
- Send Private Message


Joined: 6/22/2014
Posts: 46
I noticed that the brown wire on the left plug of my alternator came loose. Car seems to run fine. Not sure how long its been that way. Do I need to attach it back? Thanks for any help

____________________________________
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
6/22/14 5:20pm - Reply: 'Re: alternator'
dyoes
Former Member
- Send Private Message


Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
It's likely a ground wire and probably won't affect a thing.  But it's never a good thing to leave loose wires hanging around...  I'd do a continuity check and make damn sure it's what you think it is, and hook it back up.




____________________________________


"Let them that don't want none have memories of not gettin' any."
- Brother Dave Gardner

 Reply Reply  Quote Reply w/Quote
6/22/14 11:54pm - Reply: 'Re: alternator'
daveo76
Standard Member
- Send Private Message


Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 831
I'm pretty sure that's the one that broke on mine and I didn't notice either until one day while running errands (multiple engine stops and starts) it started cranking slower and slower and eventually the battery wouldn't turn the engine over - had to get my wife to come give me a jump.  Pretty sure that broken wire prevented the battery from being charged.  Better fix it.  

____________________________________

 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
 Reply Reply  Quote Reply w/Quote
6/23/14 11:09am - Reply: 'Re: alternator'
rraider1
Former Member
- Send Private Message


Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
The brown wire is for the GEN warning Light and should be fixed. Your local parts store should have a replacement plug with wires installed. you would splice the new plug in (make good connections)

____________________________________
Bob R
 Reply Reply  Quote Reply w/Quote
6/23/14 11:15am - Reply: 'Re: alternator'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19460
According to the wiring diagram, the brown wire comes from a fuse link down by the starter. No "Gen" warning light on this model....just the amp gauge. It does need to be repaired,at any rate...Thumbs Up

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/23/14 6:36pm - Reply: 'Re: alternator'
Bags74Vette
Former Member
- Send Private Message


Joined: 6/22/2014
Posts: 46
thanks so much

____________________________________
 Reply Reply  Quote Reply w/Quote
6/23/14 6:39pm - Reply: 'Re: alternator'
Bags74Vette
Former Member
- Send Private Message


Joined: 6/22/2014
Posts: 46
Thanks for the info

____________________________________
 Reply Reply  Quote Reply w/Quote
6/23/14 6:57pm - Reply: 'Re: alternator'
dyoes
Former Member
- Send Private Message


Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
Joel,

You've got me curious now.  Here's the setup in my car with the offending wire.  However, I don't see the brown wire on the diagram.  The two reds join together in the wiring diagram, and the heavy black is obviously the ground that's shown.  The brown doesn't appear in my drawing.  Where does the darn thing go?  I'm OCD, so I'll probably go trace it out until I figure it out...








____________________________________


"Let them that don't want none have memories of not gettin' any."
- Brother Dave Gardner

 Reply Reply  Quote Reply w/Quote
6/23/14 7:15pm - Reply: 'Re: alternator'
rraider1
Former Member
- Send Private Message


Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152

sorry I first look at my 77. Follow the wire from terminal 1 it runs to a splice point to ground. Joel would this effect operation not 100 % sure of why the ground if not hooked up to a light bulb.




____________________________________
Bob R
 Reply Reply  Quote Reply w/Quote
6/23/14 7:54pm - Reply: 'Re: alternator'
dyoes
Former Member
- Send Private Message


Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
I figured it out for my car, anyway.

My entire harness is from a '75 so I could eliminate the cable drive tach.  I had looked at the '74 diagram on my previous post.

(On an unrelated note, the tach just died.  Lots of good THAT swap did me!)

The '75 diagram shows the wire.  Tracing it out, it joins to the heavy Orange wire on the ignition switch on the column...  From there, the orange wire goes to the heater motor resistor.  And since I have Vintage Air and not a factory fan blower, I'd guess that the brown wire is doing diddly squat (at least in my car). 

And with that, gentlemen, I've officially given myself a headache. 

Dead




____________________________________


"Let them that don't want none have memories of not gettin' any."
- Brother Dave Gardner

 Reply Reply  Quote Reply w/Quote
6/23/14 9:31pm - Reply: 'Re: alternator'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19460
'74 alt diagram. Brown from the solenoid. The red section is a fuse link. I added the colors to make it easier to see.





____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/23/14 11:26pm - Reply: 'Re: alternator'
Bags74Vette
Former Member
- Send Private Message


Joined: 6/22/2014
Posts: 46
I haven't had a problem yet with my wire. Plenty of battery juice. Maybe its for nothing at all

____________________________________
 Reply Reply  Quote Reply w/Quote
6/24/14 1:25pm - Reply: 'Re: alternator'
rraider1
Former Member
- Send Private Message


Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152

Joel I am missing something (easily confused) looking at your diagram B would be the heavy gauge wire Alt output, 2 is spliced to that wire for regulating out put voltage. 1 which on later models goes to the Gen light but on this year they have it going to ground. what am I missing?



And a dual terminal connector. (Repair pig-tails for this connector available at any auto parts store. Or, salvage with alternator if pulling the alternator from a vehicle).
The #1 Terminal. (Marked with a “1” on the case)
This terminal is used to connect to the dash warning light.
For the warning light, a lamp is wired in series with a switched voltage source. During normal operation the lamp stays off. If the regulator is damaged, the #1 terminal provides ground, and the warning lamp will light. Usually.
This terminal is also active on 1 wire regulator equipped 10SI alternators.
The #2 Terminal. (Marked with a “2” on the case)
This terminal is used to excite the 10SI into operation. (3-wire 10SI)
It is connected to the battery positive.
For simplicity you can connect the #2 connector pigtail directly to the “batt” terminal on the alternator.



|UPDATED|6/24/2014 11:25:02 AM (AZT)|/UPDATED|


____________________________________
Bob R
 Reply Reply  Quote Reply w/Quote
6/25/14 11:51am - Reply: 'Re: alternator'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19460
Bob, I think these are wired like that because they have AMP gauges, where the later cars have voltmeters.The diagram does looked kinda silly, with the batt feed AND the brown from the solenoid spliced together, along with other hots....makes ya wonder why. It has to do with the wiring for the amp gauge. Big smile

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
7/2/14 12:01am - Reply: 'Re: alternator'
Bags74Vette
Former Member
- Send Private Message


Joined: 6/22/2014
Posts: 46

Found out that brown wire was my problem. Got it fixed with a new plug



____________________________________
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 General Discussion
(Moderator: Adam Wartell, Norsky, Adams' Apple)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30