Since it is now dangling, what is the normal position?
plunger switch
Thread Starter
Intermediate
Joined: Oct 2004
Posts: 25
Likes: 0
From: Hawaii
plunger switch
I have a newly purchased '77 and am still learning about it. There is a plunger switch hanging loose from under the dash to the left of the steering column. It has its own bracket, and a rubber bumper that looks like a tire valve cover. I haven't done the upside down and under the dash inspection yet, but does anyone have the easy answer to what it is? I tried depressing it, and nothing. Thanks. 
Burning Brakes
Joined: Jun 2002
Posts: 837
Likes: 3
From: Texas
That sounds like the headlight override or "pulldown" switch. It normally stays in the up/in position. If you ever need to change a headlight bulb you pull that **** down before shutting off the engine which releases the vacuum and the headlights will stay up.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by green
I have a newly purchased '77 and am still learning about it. There is a plunger switch hanging loose from under the dash to the left of the steering column. It has its own bracket, and a rubber bumper that looks like a tire valve cover. I haven't done the upside down and under the dash inspection yet, but does anyone have the easy answer to what it is? I tried depressing it, and nothing. Thanks.
Burning Brakes
Joined: Jun 2002
Posts: 837
Likes: 3
From: Texas
It should be attached to underside of the dash just about where you describe it.....with 2 screws I believe. The override switch is actually mounted to a metal bracket that is mounted to the underside dash. The plunger will be pointing straight down......just left of the steering column. I hope this is making sense... 
Thread Starter
Intermediate
Joined: Oct 2004
Posts: 25
Likes: 0
From: Hawaii
Yeah the brake lights work, so that leaves the headlight thing. I don't really want to test that just yet, because of another problem I have, which is that the headlight door arms are scraping the front clip when the lights open just enough to scrape the paint. Dynamic Corvettes' website said that my V-bar headlight mounting bar might be corroded and sagging, which turned out to not be the case, but that the fiberglass has delaminated and is popping up in that area. Soo, just another project added to the list. Thanks.
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Race Director
Joined: Nov 1999
Posts: 10,643
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From: Foxfield CO 1970 Convertible
If you owned a '70, I'd say that was the cable to reset the odometer. On mine, I push up and turn until the odo reads zero... 
Do the '77s have electronic speedometers/ odometers??
Do the '77s have electronic speedometers/ odometers??
Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
If you owned a '70, I'd say that was the cable to reset the odometer. On mine, I push up and turn until the odo reads zero... Do the '77s have electronic speedometers/ odometers??
Do the '77s have electronic speedometers/ odometers??
Advanced
Joined: Jun 2004
Posts: 96
Likes: 0
From: Novelty OH
same
Originally Posted by Z-man
If you owned a '70, I'd say that was the cable to reset the odometer. On mine, I push up and turn until the odo reads zero... Do the '77s have electronic speedometers/ odometers??
Do the '77s have electronic speedometers/ odometers??
