There is a vacuum line attached to the back of the headlight switch on the dash. When you pull the switch out to turn on the lights this allows vacuum to open the light doors through rubber vacuum lines. When you turn the lights off this cuts the vacuum to the lights and a spring opperates the doors and closes them.
The headlights require a vacuum to operate down. If there is no vacuum they remain in the up position. You may have a vacuum leak such as a disconnected or broken vacuum line. I have also seen the vacuum reservoir can rotted out and unable to hold a vacuum.
Yes, the headlights should be completely identical.
go to http://www.supermotors.net/registry/media/611233
A Corvette that was built in late 1976 up to late 1977.
Your vacuum system has a leak. If both of your doors stopped working at the same time, I would check up stream from the actuators. Check out docrebuild.com for diagrams and the parts.
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== == more than likely your dimmer switch is bad,hope that will help
Spark plug gap for a 1977 Corvette using ACDelco R45TS is .035
No, the last year for the Corvette to be called a Stingray was in 1976.
You can find a diagram of a 1977 Corvette horn assembly at your local library. Look in the car repair section for a Corvette repair book.