Question about 1974 Chevrolet Corvette C3

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Vaccum diagram for headlights on a 1974 corvette

Diagram of vaccum hoses for the headlights

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PyroPCMan
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SOURCE: 1977 chevy corvette wiring diagram

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All the diagrams for your corvette can be found here:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008370b

Headlight wiring is towards the bottom of the page.

Hope this helps, have fun wrenching on that vette.

Posted on Jul 04, 2008

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SOURCE: emission vacuum hose routing 1987 corvette

There's are two stickers on the top of the radiator. There is one at the filler cap that shows the pulley and belt arrangement and the other one shows the routing of the emission hoses with charcoal canister.

Posted on Apr 01, 2009

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SOURCE: Headlight wiring diagram for 1972 Corvette

chilton profellional power accessory and wiring diagrams manual 1968-73pps 666-674. I have it right in front of me. but don't have means of transmitting. any ideas? swamprat73@hotmail.com

Posted on May 21, 2009

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SOURCE: Need wiring diagram for 1979 corvette

Tried to reach you twice...I have the entire car diagram just need to know how/where to send!!!

Posted on Jun 12, 2009

  • 86 Answers

SOURCE: 1974 Chevrolet Corvette manual

go down to the public library look for corvette chilton manual copy the pages you need and you have your wiring diagram for free.

Posted on Aug 14, 2009

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Ihave a 1976 corvette stingray when i BOUGHT IT IT DID NOT HAVE THE ORIGINAL POP UP LIGHT i have since purchased a pair and fitted them in I cannot wiork out the vaccum lines do I have to have the by pass...


The vacuume line starts at the carburetor. From there it splits into two lines: one for the operating system and another for the control system. It is in the control system that you will need to have the override switch you referred to. Once you run new lines, you will need to make sure your two regulators and two actuator motors are functional. If you have everything run correctly, and there is vacuum in your canister and the headlights still will not pop up, then most likely you have a faulty regulator or actuator motor. Go to www.ecklers.com then search "headlight guide" that will show a manual on how to run all the vacuum hoses and other tips on installation. A vacuum guage is handy to have to test for vacuum leaks at different areas of the line.

Feb 20, 2010 | 1984 Chevrolet Corvette

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1974 corvette 4 barrel secondary will not kick in. How and where do the vacuum lines run to make it work? Vacuum diagram would really help. Thanks


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1974 Chevrolet Corvette manual wiring diagram


go down to the public library look for corvette chilton manual copy the pages you need and you have your wiring diagram for free.

Aug 14, 2009 | Chevrolet Corvette Cars & Trucks

1 Answer

Headlight wiring diagram for 1972 Corvette


chilton profellional power accessory and wiring diagrams manual 1968-73pps 666-674. I have it right in front of me. but don't have means of transmitting. any ideas? swamprat73@hotmail.com

May 21, 2009 | 1972 Chevrolet Corvette

2 Answers

Need wiring diagram for 1979 corvette


Tried to reach you twice...I have the entire car diagram just need to know how/where to send!!!

May 12, 2009 | 1972 Chevrolet Corvette

2 Answers

Replacing headlamp vacuum hose in dash


I have a 1970 Corvette, and a 1976 Corvette. I restore and customize Corvettes.

So you're getting ready to do the Fun(?) stuff, huh? Yes sir, nothing will make your day more than replacing your vacuum hoses for the headlamps.

I'm going to detail the hoses out, and the parts they connect to. Then I'm going to give you a link, that I feel will show the headlight vacuum diagram in great detail, plus a few tricks from me.

Let's start with the hose that comes from the intake manifold. The main supply of vacuum. It comes from the rear of the intake, and goes over to a Vacuum Filter. The vacuum filter is an item to replace, as it's a possible source for a vacuum leak, and prevents contaminating particles from entering your engine.
From the vacuum filter there is a hose to a Check Valve. (Another item to replace) The check valve then splits into two fittings. Two hoses come off of it. One hose leads into the firewall, and comes up under the dash. It connects to the light switch. The light switch has two fittings on it. One towards the pull knob, one towards the end of the light switch. This hose connects to the fitting at the end of the light switch.

The fitting on the light switch towards the pull knob, has a hose that comes off, and goes to the Pull Down Switch. (Manual Override Pull Down Switch) The little plastic knob you pull to keep the headlights up, or push in, so they the headlights will close when the headlights are turned off.

The other hose that comes off of the Pull Down switch, goes along the left fender well, and ends at the front of the car. It fits into a plastic 'Tee'. The Tee has two hoses coming off of it. One hose goes to the Left headlight Relay Valve. The other hose goes to the Right headlight Relay Valve.

From here the hoses are color coded. You may not be able to see this color code anymore. The color code of these hoses, is Red, Yellow, and Green.

On the Relay Valve it has a vacuum diaphragm chamber. This chamber looks like two pie pans put together. There are three fittings on the Relay Valve body. There is a fitting on the chamber itself. The hose coming from the Tee I described above, goes to the chamber fitting. The other hose coming from the Tee, goes to the other Relay Valve chamber. Doesn't matter which hose from the Tee, goes to what Relay Valve chamber. But when you look at it, you'll know how to lay those hoses out. You don't want then twisted over each other.

The fitting on the Relay Valve that is on the body of the valve, and nearest the chamber, is Red in color. It has a hose that goes to the back of the Actuator. The 90 degree bent metal tube. The actuator looks like two pie pans put together, too. The Actuator has a rod that comes out of the middle of it, and is what actually moves the headlight.

At the end of the Relay Valve body is a fitting. The one furthest away from the chamber. It has a Green hose coming from it. This hose goes to the Actuator on the other side. It connects to a straight fitting, in the middle of the actuator. This is the same for the other side.

The fitting in the middle of the Relay Valve body, has a Yellow hose coming from it. It goes to that long cylindrical tank in the front of the car. At each end of this tank are the bumper brackets.
This hose connects to a fitting at the end of the cylindrical tank. The cylindrical tank is the Vacuum Reservoir. Same thing for the other side.

The last hose is where we left off at the Check Valve. One hose went to the headlight switch. The other hose runs along the fender well, and connects to the Vacuum Reservoir. The long cylindrical tank up front.

Tricks:
1.With vacuum built up, press the rubber seal that's on the shaft (Rod) coming out of the Actuator. If you hear a vacuum leak, the seal is bad. This seal can be replaced without having to replace the Actuator. It isn't easy, but it isn't that tough.

2.With the check valve removed, blow air into the single inlet. If you can blow air through it, this check valve is shot. It's about $14 and should be replaced.

3.If the Vacuum Filter is soiled looking by holding it up into a bright light, and looking at it, it should be replaced.

4.The best method if your budget will allow, is to buy those vacuum hoses as a kit. They are color coded, and come with instructions.

Mar 20, 2009 | 1972 Chevrolet Corvette

4 Answers

1977 chevy corvette wiring diagram


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All the diagrams for your corvette can be found here:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008370b

Headlight wiring is towards the bottom of the page.

Hope this helps, have fun wrenching on that vette.

Jul 04, 2008 | 1977 Chevrolet Corvette

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