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Mercury Brake light switch.

Submitted by jonathan_clinkard on Mon, 03/04/2017
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Heavy Twins

I would like to replace the brake light switch on my Mercury. Would it originally have been fitted with a Lucas switch number 31383, or the more button-like switch, fitted to some Commando models? I have looked at many Mercury photographs, but it's hard to see which switch was originally fitted. I hope someone can help, Joff Clinkard.

Submitted by jonathan_clinkard on Mon, 03/04/2017

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Dear Fritz, I had a feeling that I'd read about this on the messages site before, but recent searches I made didn't pick it up. Really interesting to read the links you sent. The always on, set up makes good sense and from the photo therein looks very tidy. Thank you for your help in this,

Joff.

Submitted by fritz_wettstein on Tue, 04/04/2017

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I've entered ?brake AND switch? in the search box to find the threads with the appropriate topic.

Fritz

Submitted by robert_tuck on Wed, 05/04/2017

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The correct switch is availiable now from several sources. Many years ago when the only switch made was the wrong type and sold by a Norton dealer with the instruction" mount it upside down" !!. I dismantled one and reconstructed it with solder and rivets, its still working 25 years on.

Submitted by howard_robinson on Wed, 05/04/2017

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Jonathan I believe the correct switch fitted was the Lucas Model 118SA Part Number 3415A. It was a fragile plastic device with a rubber cover covering the plunger-type switch. It was adopted in 1967 for the Atlas engined Matchless Hybrid Models and then used on the Mercury. On my own Mercury I have fitted the older Lucas metal Model 22B that was fitted to the Atlas and 650SS models. It works satisfactorily but does look aged. Cheers, Howard

Submitted by jonathan_clinkard on Fri, 07/04/2017

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Thankyou Robert, you made a good job of that switch. These parts are certainly much easier to come by now. Regards, Joff.

Submitted by jonathan_clinkard on Fri, 07/04/2017

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Dear Howard, Good information thank you. I am inclined to do exactly the same as you, the 118SA switch seems to have a pretty bad reputation and when correctly fitted, the 22B looks tidy enough.

All the best, Joff.

 


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