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Old 03-09-2017, 04:39 PM   #1
hamerDown
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1981 Stop Light Switch

If u haven't changed this switch ohhhh it's fun...not!
Remove the front seat (you'll need the room) remove the little vacuum panel, remove the AC/htr duct and contort your Body like a Pretzel to look up under there. Oh it's right there 'if' you have little Squirrel Monkey hands!
So, first thing...the top switch pictured is a so call "exact replacement" for a 1981 "w/cruise control" (bullshit)
Switches with "Cruise Control" will have two plugs.
The bottom switch pictured is what came out...notice there is a difference! I would replace with that exact type switch or read the very below.
I took the pic wrong in that, the OE switch's front-plug prongs will be facing down (at least mine was) and the other plug goes in the rear of the switch.
The new replacement switches prongs will also have to facing down and both plugs must go in the underside or slightly rotated towards the door (if ur lucky enough to have extra slack-wire for the REAR PLUG...I didn't grrrrr)

Guess what...when I installed the NEW so called "exact replacement Switch"... there was NOT enough wire to make the second bottom rear connection. SOB...I couldn't pull 1/8" slack to make that frickin connection and I needed about 3"
I called the manufacture (because they tell you to call for fitment issues) and raised a 'little Hell" about this being an "exact replacement" and the Joker said..."well just pull down some more wire"...I wanted to slap him through the phone.
In short and there wasn't enough wire hanging-down in the first place (just barely enough to get a finger on and it wasn't easy) I had to extend the rear wires/plug by about 3". The problem...there isn't room under there to solder (but how I did it) and your body is contorted into a painful Pretzel, but, I did it!
NOTE...after the job was done and everything was functioning fine again (and nothing on a Vette is easy to work on) I didn't realize the OE switch could be opened-up and EASILY FIXED! For some reason I thought the plastic switch was melt-welded-sealed. Anyhow, just cleaning up the little contact-points in the OE switch and it would have been as good as new without all the above aggravation.
Long rant above huh...but maybe it will help the next person replacing that little darn switch.
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Old 03-10-2017, 05:34 AM   #2
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I pulled the speedo and tach and got the switch out going down that way.
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Old 03-12-2017, 09:25 PM   #3
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I pulled the speedo and tach and got the switch out going down that way.
I couldn't imagine getting my Catchers Mitt size hands down that hole, especially with the steering wheel on...but if it worked for you
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Old 03-13-2017, 06:10 AM   #4
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I run 6 feet by 240 so either way its pain in the ass.
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Old 03-13-2017, 03:35 PM   #5
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I run 6 feet by 240 so either way its pain in the ass.
I always tell people..."the only fun thing about owning these cars is driving it, cause they sure are a PITA to work on"
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Old 03-13-2017, 04:33 PM   #6
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Hey Hammer,
Look to the left of that brake pedal, and if you're lucky enough to have one, up high on the clutch pedal there's a little linkage bar (it's blocked from sight by the brake light switch) that goes to the neutral safety switch, it sticks in the clutch pedal arm and has a delicate little clip to hold it in place.
Now that the new pedal box is nicely installed and all the dash back together, I need to pull that linkage off to make a longer/adjustable one!
I was under there for a couple hours last weekend trying to adjust the brake rod and clutch, I cussed the entire time. Even invented some badly needed new cuss words when the old ones wouldn't do it for me anymore. I feel your pain!
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Old 03-14-2017, 05:22 PM   #7
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Hey Hammer,
Look to the left of that brake pedal, and if you're lucky enough to have one, up high on the clutch pedal there's a little linkage bar (it's blocked from sight by the brake light switch) that goes to the neutral safety switch, it sticks in the clutch pedal arm and has a delicate little clip to hold it in place.
Now that the new pedal box is nicely installed and all the dash back together, I need to pull that linkage off to make a longer/adjustable one!
I was under there for a couple hours last weekend trying to adjust the brake rod and clutch, I cussed the entire time. Even invented some badly needed new cuss words when the old ones wouldn't do it for me anymore. I feel your pain!
It's no joke working on these Cars...a mechanic friend said to me; "when your car needs a new Heater Core burn it and collect the Ins money"
Anyhow, no clutch in my 81 but while working up under there I did notice ANOTHER plunger type switch. It was just above and to the left of the stop light switch...any idea what that is for?
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Old 03-14-2017, 06:53 PM   #8
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Originally Posted by hamerDown View Post
It's no joke working on these Cars...a mechanic friend said to me; "when your car needs a new Heater Core burn it and collect the Ins money"
Anyhow, no clutch in my 81 but while working up under there I did notice ANOTHER plunger type switch. It was just above and to the left of the stop light switch...any idea what that is for?
I think it's to cancel the cruise control when you hit the brake.
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Old 03-20-2017, 04:23 PM   #9
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Quote:
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I think it's to cancel the cruise control when you hit the brake.
Mmmm don't think so, but maybe.
My research showed the 81 Vetts with Cruse Control (like mine) have a stoplight switch with TWO separate plugs going to it.
Vetts without Cruse Control showed a picture of the Stoplight Switch just have one plug going to it.
Anyhow, that other switch above and just to the left of the stoplight switch looks even harder to get to.
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Old 03-21-2017, 08:44 AM   #10
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Second plunger....

First guess is torque converter lockup control, second guess would be if it's a th400 car then somewhere down there is an electric kickdown switch for the throttle.
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Old 03-21-2017, 02:53 PM   #11
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Quote:
Originally Posted by Slow & Leaky View Post
Second plunger....

First guess is torque converter lockup control, second guess would be if it's a th400 car then somewhere down there is an electric kickdown switch for the throttle.
Being I personally pulled and rebuilt the transmission myself back in late 2013, early 2014 (I should remember this) but I'm 99.9% sure my Trans is a TH350c
I do recall kickdown cables coming out of the passenger side of the transmission up to the carb.
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Old 03-22-2017, 05:53 AM   #12
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Second plunger....

First guess is torque converter lockup control, second guess would be if it's a th400 car then somewhere down there is an electric kickdown switch for the throttle.
I'll bet that's it!
Been a while since I was digging into all that, but as much time as I spent there you'd think I'd remember. And I put an '84 (I think) t&t column in mine. Old age ...CRS syndrome
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