go to http://www.supermotors.net/registry/media/611233
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.
Yes, the headlights should be completely identical.
I can' help with a diagram. I can just suggest you do them one at a time, so as to not need a schematic.
Linked is the diagram for a 1976 Cadillac DeVille, 1977 should be roughly the same...
Which vacuum diagram The Underhood for the engine or the vacuum for the interior /AC system?
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.
You can get the vacuum diagram for the 1977 Jeep J10 from the Chilton's manual for that vehicle. You can purchase the manual in almost any auto supply store.
Remove 2 nuts that hold it in place and disconnect it form the headlight. It should pivot out of position.
All vehicles come with an emissions label and a vacuum diagram. If yours is missing, the parts dept at your local Toyota dealer can get em, cheap.
Which diagram do you need, the one for the lever assembly or one for the rear brake assembly? Let me know and I can send them to you.
http://www.autozone.com/autozone/rep...00c152801db29f
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.