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Mercury tilt switch

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Old Apr 9, 2026 | 01:37 PM
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Mercury tilt switch

This may be a bit off topic but I wanted a tilt switch for lights under the hood on my Camaro. The stuff I could find online all had mixed reviews. The stock light socket is an old mercury switch so I got to thinking.....

I had an old mercury bulb thermostat lying around so decided to pull it out of the thermostat carefully! I had some foam "clay" that I am using for another part of my project.

First I tested the bulb as a tilt switch on a 12v light and it worked great. I cut the wire spring off but left a tab for a connector.

I wrapped the bulb in clay and shaped it with a paint stick dipped in water and stood it on end. The foam clay is to protect it from breaking and I am confident I could drop it from 10ft without it getting damage. However, it is not crust proof.

I left it out overnight to dry and when I came back it had fallen over. But sometimes you get lucky with a mistake. All of the uneven parts smoothed out and it took a shape that will be easy to mount. The bottom is perfectly flat and it looks almost like a factory piece.

so if you ever need a tilt switch and have an old thermostat I think this is probably a good solution.







 
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Old Apr 9, 2026 | 02:08 PM
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I can't wait for you to drive it at night and get to witness the paparazzi effect from under the hood!
 
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Old Apr 9, 2026 | 04:32 PM
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lol, I have to figure out how to mount it at the correct angle so every time I accelerate the hood light doesn't go on!

It's going to be a few m months now. It goes into paint on May 1 and then there is assembly. When it is together I will post some pics!
 
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Old Apr 9, 2026 | 07:01 PM
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Have you ever looked into something like this..?
Amazon Amazon
 
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Old Apr 9, 2026 | 07:14 PM
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Old Apr 9, 2026 | 07:19 PM
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https://www.sherco-auto.com/products...aETsyH7A9chZ_e
 
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Old Apr 9, 2026 | 07:19 PM
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Maybe I just have a sick sense of humor, but I'd paint it white and put a fake timer on it. And the wires would look like they went into a blasting cap.

 
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Old Apr 9, 2026 | 08:25 PM
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Nice thing about mercury switches is they never wear out. I have seen them used in old houses and also grain bins. The first time you pull out a switch and tilt it to work on the wiring and things start switching on and off is a surprise. LOL
 
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Old Apr 9, 2026 | 10:10 PM
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Thats certainly simplifies things!
 

Last edited by 8pack; Apr 10, 2026 at 05:49 AM.
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Old Apr 10, 2026 | 10:50 AM
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My 78 Bronco had an under-hood light that came on when you opened the hood and contained a reel of the wiring that allowed you to pull it out and would reach to the rear of Bronco you then could set the light down to change the tire. It was a factory install accessory. Think they used them up into the 80's. Looked very adaptable.
 
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Old Apr 10, 2026 | 10:58 AM
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Originally Posted by 5851a
My 78 Bronco had an under-hood light that came on when you opened the hood and contained a reel of the wiring that allowed you to pull it out and would reach to the rear of Bronco you then could set the light down to change the tire. It was a factory install accessory. Think they used them up into the 80's. Looked very adaptable.
My Datsun 280Z had one too.
 
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