It is possible that the headlight door wiring is degraded to the point of not working. After nearly 50 years, it could be time to replace the wiring harness.
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Check the fuses and the relay that controls the door locks. A power loss is the most likely cause of the problem.
First. Check the fuse. Second, make sure the headlight doors open. If the doors won't open, the headlights may be on, behind the doors. If it's the doors, a quick fix is, wire them in the open position, till you fix or replace the headlight door motor. (a whole different matter) You could wire them in the open position but you don't have to. If you look under the front of the car you will see where the wire plugs into the motor that operates the headlight doors, unplug this wire. Then look below each headlight door and you will see a rod hanging down, this is there to operate your headlight doors in case the doors don't open. Turn these rods until your doors open and they will stay open until you plug your wire to motor back up, or you close them yourself.
I believe that there are two speaker grills on the dash they are 3.5 In. Than in the doors its 6in and in the rear it 6x8 but I put some 6x9 in mine!
The doors are controlled by a vacuum hose. Chances are the vacuum hose cracked or broke due to age allowing a leak. replacement hose is available by the foot at any auto parts store, take in a piece to match the size of the hose.
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.
Hi, I know that you can open them manually if they are stuck closed, problem if driving at night. Just behind the grill, there is a mechanism to manually operate the doors. You can see it and get to it easily by crawling underneath. However, it sounds like you need a new motor for the doors. These are pretty easy to come by at a salvage yard or possibly on ebay. rtalk7
Behind the vacuum-operated headlight doors
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Speed in opening. Note: It StarTrek, the moving doors took three people to operate.
Behind the vacuum-operated headlight doors
Pneumatically powered machines, Bus doors/suspension, automatic doors and light lifting gear.