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: 12 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

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

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

Vanity Plates
ILRUNYA
bradjarmstrong
Featured Links

Buy Now
The Corvette Factories: Building America's Sports Car (Hardcover)
The Corvette Factories: Building America's Sports Car (Hardcover)


Corvette from the Inside
Corvette from the Inside


Chevrolet Corvette Restoration Guide
Chevrolet Corvette Restoration Guide


Motor Trend - $5 for 12 issues.
Motor Trend
Only $5 for 12 issues.



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
2/3/14 4:32pm - Original Message: 'getting started'
teamo
Limited Member
- Send Private Message


Joined: 2/3/2014
Posts: 12
First Vette, a 75 L48 auto given to me by my Brother. It has been sitting under a carport since around 1992. It currently doesn't run so I have lots of work to do. Body is in pretty good shape. Full tank of gas since it was parked so I am in the process of siphoning that out and preparing to put the car up on stands so I can get a look at the undercarriage. The animals got inside and I am not sure of the condition of the wiring. My plans are to get it running and driving and do a restoration as I go along replacing what it needs as time/$$$ allow. I am planning on returning it to stock (mostly) condition.  I have been researching a little bit and it seems that it has a rear bumper cover from a '76 and also a hood from a 77 or later. I will eventually replace these with the correct parts. I bought the assembly manual as well as a Haynes repair manual. So my first questions is I have been seeing engine wiring harnesses in the catalogs. What is the difference between a harness with seat belt interlock and non interlock? How do I know which one my car came with? Thanks.

 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
2/3/14 10:57pm - Reply: 'Re: getting started'
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: 19458
Most of the early '75 cars did have the seatbelt interlock system, even tho the mandate for them was removed.
If you look under the hood on your car, and the passenger side, above the A/C-heater box, IF the car had the interlock system, you will see an orange connector bolted to the firewall, with a relay inserted. Also, if you look in the very back of the rear storage compartment, on the driver side, under the carpeting, you will see the electronic "Logic" module if the car had the system.
And finally...if it has the system, and the system is working, you will not be able to start the car without first sitting in the seat, and fastening the seatbelt...in that order.
hth




____________________________________
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
2/4/14 8:46am - Reply: 'Re: getting started'
teamo
Limited Member
- Send Private Message


Joined: 2/3/2014
Posts: 12
I will have to go out and look for it today. I don't recall seeing the relay over the ac/heater box so I will have to look in the back under the carpet. The car has been hacked up somewhat with lots of things removed. I want to put all of it back to factory correct. I am not looking for a show car but a good driver with all of the correct parts/options.
Another thing I don't have is the air pump. The corvette restoration guide says that some but not all 73-75 small blocks had the air system. The car has headers on it so the manifolds are gone. Doesn't look like the bracket is there for the pump so how do I know if the car had the air pump? 
 Reply Reply  Quote Reply w/Quote
2/4/14 1:04pm - Reply: 'Re: getting started'
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: 19458
The small block automatic cars('74-'75) did not have the air pumps, iirc.
Look to see if your seats have a wiring harness coming from under them....you should be able to see it with the seat pulled forward, and tilted forward. If you do not have the seat switch harness on either seat, your car prolly did not have the interlock. It was mostly only installed on the early '75s. The orange connector with the relay is usually a good sign it had it at one time, but not a definite. The wiring harnesses could still be used, they just dint install the electrical stuff like the relay, or the logic module. They would use them until they ran out of them, and then use the newer, updated harness.
What is the build date of your car? That will help narrow down the possibility. Wink


____________________________________
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
2/4/14 4:16pm - Reply: 'Re: getting started'
teamo
Limited Member
- Send Private Message


Joined: 2/3/2014
Posts: 12
I will have to find the build date and investigate further. I assume that they all had cat converters so I thought that the converter needed the extra shot of air from the pump to do a complete burn of the spent gasses? should  I buy the exhaust manifolds with the plugs or did they use manifolds with no holes on the small block cars without the pumps?

|UPDATED|2/4/2014 2:16:39 PM (AZT)|/UPDATED|
 Reply Reply  Quote Reply w/Quote
2/23/14 8:33am - Reply: 'Re: getting started'
teamo
Limited Member
- Send Private Message


Joined: 2/3/2014
Posts: 12
I found the numbers on the front of the engine as well as the data on the driver's side hinge area. The sequential numbers for both plates match so it looks like this engine was the original engine for this car. The door area plate indicated E03 which if I have it right states that this car (body) was built Feb. 03 of 1975? Would this be subject to the seat belt interlock? There are two small bolt heads above the engine compartment heater core box. Would these bolts have been put there in place of the seat belt interlock module or should this area be smooth and free of any fasteners? I found a relay and flasher in the rear storage passenger box (the one with the jack in it). From what I have read this is part of the alarm/security system. Also there are two wires near the passenger female seat belt buckle but they are not hooked up to anything. I am also trying to find out if this car had the air pump. Some have suggested that the l48 auto cars did not have the air pump but I have seen more than a few for sale online and they clearly have the air system installed.
 


|UPDATED|2/23/2014 6:33:01 AM (AZT)|/UPDATED|
 Reply Reply  Quote Reply w/Quote
2/23/14 10:43am - Reply: 'Re: getting started'
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: 19458
A Feb '75 built car would NOT have had the interlock. The wiring you see on your inner belt latch is for the seatbelt warning light...all cars had that.
Cars delivered to California DID have the smog pump, regardless of engine size, so you may see some with the pump, but small blocks delivered to other states were not required to have them.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
2/23/14 11:33am - Reply: 'Re: getting started'
teamo
Limited Member
- Send Private Message


Joined: 2/3/2014
Posts: 12

That's good news I didn't want to deal with any issues with the seat belt interlock. I have an efe actuator and exhaust manifolds on the way. Without the air pump how do I deal with the fitting in the "y" pipe for the smog tube? Is there a single plug to cap it as in the earlier years that had caps for all of the holes in the manifolds?

 Reply Reply  Quote Reply w/Quote
2/23/14 4:28pm - Reply: 'Re: getting started'
F4Gary Gold Member
Gold Member
- Send Private Message


Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 871
If it's not going to be a show or "judged" car, why would you want to put that crap back on if you don't have to?  It's expensive and just garbages up the engine compartment.  The air pump didn't pump air to the cat, just to the manifolds.

____________________________________
 Reply Reply  Quote Reply w/Quote
2/23/14 6:08pm - Reply: 'Re: getting started'
teamo
Limited Member
- Send Private Message


Joined: 2/3/2014
Posts: 12

I would like to return the car to as close to original as possible. I don't have any intention of having it judged but I do enjoy researching what it should have and putting it back to the way it looked when it was new. Also I want this car to be able to pass inspection without them failing me for not having the correct emission equipment installed.

 Reply Reply  Quote Reply w/Quote
2/23/14 8:14pm - Reply: 'Re: getting started'
F4Gary Gold Member
Gold Member
- Send Private Message


Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 871
teamo said:

I would like to return the car to as close to original as possible. I don't have any intention of having it judged but I do enjoy researching what it should have and putting it back to the way it looked when it was new. Also I want this car to be able to pass inspection without them failing me for not having the correct emission equipment installed.



That's fine.  I like researching my car too, and if your state requires it, then so be it.  But I think it's not required for a car over 25 or 30 years old.  So, whatever.


____________________________________
 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