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A Tale of Two Switches

Moseso

Jedi Knight
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I know this is going to be a HUGE shock to readers of this forum, but I have recently suffered a spate of electrical failures in my TR3.

1) My brake lights failed to light up anymore, even when I pressed on the brake pedal. I removed the wires from the switch and touched them together: They light. I put a continuity buzzer on the switch and press the pedal: Nada. Conclusion: Dead switch. This switch was a replacement, installed at the time of the rebuild -- had about 8000 miles on it. Many people here have talked about putting a pedal switch on the pedal box as an alternative to the hydraulic switch. Given the performance record of the one in my car, that seemed the best idea. I went to Napa and found a switch with a 3/8" (10mm, actually) shaft that would fit the hole Triumph thoughtfully provided in the pedal box for this purpose, extended my wires to reach it and, presto, everything works again.

2) A couple of days later, getting out of the car, I feel something hit my leg. I look around, don't see anything and forget about it. The next day, getting in my car, my foot hits something. I look and retrieve a large coil spring, about 2-1/2" long x 3/4" diameter. I KNOW that there's nothing like that up under the dash, and as I'm scratching my head wondering where this thing came from and what it is, I happen to notice that my headlamp dimmer switch looks "funny." AHA! I feel around the front edge of my seat and, sure enough, there's the cap from the dimmer switch. Last night I had to work, and drive home after dark, so before I took the car, I made sure that the switch was locked on low-beams. Today I removed the switch. The cap and spring are held to the pot metal actuator rod by a swage on the end of the rod. After only 51 years, this cheap POS arrangement had failed, although the switch innards still work fine. So -- I drilled a hole down into the end of the actuator rod, and tapped a small screw into it -- put the screw, with a lockwasher on it, through the hole in the cap and screwed the cap and spring back onto the shaft. Total cost: too low to mention here.

I've had so little trouble with the car that these are the worst stories I have to relate this year. I thought that it was pretty funny that they were both Lucas stories, and that they happened within a week of each other.
 
So your good for another 50+ years!
I was impressed to find a date on my dimmer switch. Those parts last a long time.
John
 
Planned (fifty yeaar) obsolescence!

The best thing to my mind is the stuff can be disassembled and MacGyver'd to work again! I've "reman'd" so many forty and fifty year old English parts I consider the stuff infinitely renewable. :wink:

...try THAT with any of the new "snap together" switches or other parts on most "modern" cars.
 
Moses, are you using silicone brake fluid?? I've read here, and have seen a couple of guys in the club have problems with the TR3 brake pressure switch when using silicone fluid. I don;t know why that should be a problem, but there seem to be too many cases popping up for it to be a co-incidence.
 
No. I'm using old school brake fluid. That's not the issue. I think crappy manufacturing is the issue.
Every part on that car that didn't ABSOLUTELY NEED replacement got re-used. It wasn't until I was reassembling the brake system, and I realized one of the spade lugs on the old brake switch had broken off, that I ordered a replacement. Hopefully, the Napa switch will last longer. At least I don't have to bleed the brakes to replace it.
 
martx-5 said:
Moses, are you using silicone brake fluid?? I've read here, and have seen a couple of guys in the club have problems with the TR3 brake pressure switch when using silicone fluid...

Were you wearing a baseball cap when the switch failed? I was and I met someone else who was also wearing a baseball cap when his failed.

IOW -- these switches are prone to failure + lots of people use DOT5. Trees make the wind blow by waving their branches, I've seen it happen.

Seriously, I added a relay to the brake circuit and am hopeful this will extend the life of that pressure switch as the ones available seem to need help though the mechanical switch is a pretty foolproof approach that can also be adjusted for a hair trigger.
 
well at least we can work on our cars, just wait for another 40 years when the bemers now have 40 years on them, first will they still be here and second I bet no way in heck will anyone be able to work on them in their garage, wait will there still be houses? will there still be cars? will there still be gas to propel them? or will our government have stolen everthing we worked hard for and give it to the ones that dont work, then yes they probably will dissapear and hopefully the TR's will still be going strong

Hondo
 
Frequency of solar flare events is increasing, s'posed to be significant by 2013. That oughta put an end to all this frivolous acceptance of MICROCHIP technology.

Have a good siphon pump to hand and keep your LBC in good shape. :devilgrin: :jester:
 
DrEntropy said:
Frequency of solar flare events is increasing, s'posed to be significant by 2013. That oughta put an end to all this frivolous acceptance of MICROCHIP technology.
Heck, with that whole Mayan 21 December 2012 thing, who's worried about solar flares in 2013? :eeek:
 
I believe the 2013 Solar storm and the December 2012 Mayan calendar thing are one and the same. (Statistical error of .015% when the Maya were calculating their calendar.)

And -- YES -- I WAS wearing a baseball cap when the brake switch went south! Whoda thunk it? Time for some new headgear, to be sure -- but what kind has proved harmless to Lucas hydraulic brake light switches?
 
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