Bonnet and boot light switches

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Chet
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Bonnet and boot light switches

Post by Chet » Sat Jul 21, 2018 8:18 am

After searching vainly for bonnet and boot light switches on my SE4a, I did what I'm always telling SWMBO to do - read the book. In this case the parts book. And I found that both lights should be activated by mercury tilt switches. And they are - Lucas 519 types built into the bulb holders - except after 50 years they don't work. Anybody know of a possible source of what are probably scarcer than unicorn poo? Or of info on how to revive them - I gather Rover P4 or P5 people have found a way but I can't find any reference to an article?



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Bonnet and boot light switches

Post by mark rudder » Sat Jul 21, 2018 8:49 am

Mark from down under here.
Mercury, like steel is a metal, just liquid at room temperature & toxic if ingested.
Mercury, like other metals also corrodes. Do some homework on this, but years ago
I revived an Armstrong Siddley boot switch by shorting in out across 12 volts, the
heat reverting the oxidation. Trick is don't melt the switch or burn something.
It would be worthwhile to check elsewhere before going ahead.


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David Tew
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Bonnet and boot light switches

Post by David Tew » Sat Jul 21, 2018 9:32 am

Hi Chet,

The SE4b has mechanical courtesy-light switches rather than mercury switches. Under the bonnet this was fitted on a little angle bracket at the edge of the bonnet opening on the right-hand side. At the rear it was fitted into a hole drilled through the body adjacent to the sealing rubber on the left. Unfortunately, I can't supply any pictures as my car is still in the bodyshop.

I think was was probably due to the simultaneous production of SE4b and SE5 as in the SE5 parts book you can see the bonnet switch, albeit mounted at the rear rather than the side.
Bonnet light switch.PNG
Bonnet light switch.PNG (125.32 KiB) Viewed 1091 times
Another option at the rear depends on what version of boot plunger you have. Some of them have a built-in switch which isn't used on the Coupe. I have converted the wiring to use this.

Normal Reliant caveats about different solutions on similar cars bit it's worth considering the change as the wiring changes required are minimal.

:)


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Bonnet and boot light switches

Post by DARK STAR » Sun Jul 22, 2018 9:30 pm

Yes mine is a mixture, with a mercury switch at the front which works but I don't trust it so no bulb in the socket 8)
and a plunger switch at the back by the boot latch.


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Bonnet and boot light switches

Post by Coupe Racing » Mon Jul 23, 2018 7:05 am

My 68 Coupe had a plate and plunger switch at the front and the normal switch found at the rear by the lock/striker which are normally broken


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Bonnet and boot light switches

Post by Chet » Mon Jul 23, 2018 8:06 am

Thanks all. I think the safest solution will be to retrofit plunger switches (as on SE5a bonnet light). I might be able to revive the mercury switches, but would probably always wonder if one light had stuck on whereas mechanical switches may fail to switch on, but never off.



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Bonnet and boot light switches

Post by roymck » Mon Jul 23, 2018 8:37 am

On the later Coupe the light switch for the bootlid also functions to pop up the bootlid once unlocked just enough to get your fingers under it to open . Did post this up once with the Lucas part number and fittment , it’s a well made bit of kit .



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Bonnet and boot light switches

Post by scimjim » Mon Jul 23, 2018 8:40 am

roymck wrote:
Mon Jul 23, 2018 8:37 am
On the later Coupe the light switch for the bootlid also functions to pop up the bootlid once unlocked just enough to get your fingers under it to open . Did post this up once with the Lucas part number and fittment , it’s a well made bit of kit .
http://www.scimitarweb.co.uk/sgwrs/view ... tch#p97851


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Bonnet and boot light switches

Post by David Tew » Mon Jul 23, 2018 10:41 am

roymck wrote:
Mon Jul 23, 2018 8:37 am
On the later Coupe the light switch for the bootlid also functions to pop up the bootlid once unlocked just enough to get your fingers under it to open . Did post this up once with the Lucas part number and fittment , it’s a well made bit of kit .
They do come up on eBay occasionally. Save a search for a "Rover P4 courtesy light pillar switch" and you'll get an email when one appears. I got one for £12.


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Bonnet and boot light switches

Post by Chet » Tue Sep 25, 2018 7:52 am

I've found a solution to the bootlid popup problem : Auto Electric Supplies have a door switch which ideal - part # 081503. It fits neatly, has an escutcheon which takes 2 screws, has a strong spring and its length is adjustable. GBP5.46+VAT.



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Bonnet and boot light switches

Post by David Tew » Tue Sep 25, 2018 5:05 pm

That should do the job, as long as the spring is strong enough. It is a little smaller (22mm against 26mm) but a little fettling should fix that.

Coincidentally, there are three of the original switches/plungers on eBay at the moment for £24.90 (183448034974). Not bad value if you can find two other people looking for one. :)



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Bonnet and boot light switches

Post by scimjim » Tue Sep 25, 2018 6:49 pm

Can you post a link David - item number doesn’t work?


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Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
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Bonnet and boot light switches

Post by Roger Pennington » Tue Sep 25, 2018 7:15 pm

I think this may have been it? - seems to have ended....


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Bonnet and boot light switches

Post by David Tew » Tue Sep 25, 2018 7:55 pm

Yes, that was it. Someone bought them 27 minutes after I posted the details. :(
Someone on this forum perhaps?


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Bonnet and boot light switches

Post by Oaksey » Tue Sep 25, 2018 8:12 pm

‘Twas me. I put them in my watch list this morning and meant to buy them at lunchtime. Your post reminded me :)


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