 | Home > Technical > Adding additional alarm plunger switches to TDCI |
 
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| Andy RV Member Since: 26 Apr 2014 Location: Somewhere Posts: 66  
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Just tested the bonnet switch, it’s normally open... so wiring this up in series should work?
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4th Oct 2020 4:35pm |
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| BuckBlu110 Member Since: 19 Apr 2014 Location: in the pub Posts: 714 
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Can’t see why not, not a bad idea thinking about it.
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4th Oct 2020 4:54pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6612 
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They need to be in parallel. In series they would all need to be triggered to close the circuit.
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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4th Oct 2020 5:03pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3431  
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Not sure if I understand this right, but Andy RV tested the switch and stated it is NO. That means, when the bonnet is in its closed position, the circuit is closed (which is how it should be for an alarm system). If circuit must be closed to to be ok, then all switches have to be in series so if anyone is open, the whole circuit is open. Or I am missing something? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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4th Oct 2020 5:14pm |
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| Andy RV Member Since: 26 Apr 2014 Location: Somewhere Posts: 66
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Dinnu, that’s my non-electrician understanding of it! When the bonnet is closed it compresses the switch providing continuity for the circuit. A break in the continuity is what triggers the alarm.
I’ve ordered the parts so I’ll see how I get on. I’ll need to make some brackets up to secure the switches. |
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4th Oct 2020 5:34pm |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1081  
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For all the doors it's closed door = open circuit. The switches connect to ground, when open.
Is it really different for the bonnet? Or just buy this one https://www.landroverdefendersecurity.com/...r-defender  |
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4th Oct 2020 6:15pm |
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| Andy RV Member Since: 26 Apr 2014 Location: Somewhere Posts: 66
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Just had my switches delivered, they’re normally closed, not open! Not sure how I managed that when I tested the one in-situ in the engine bay... Parallel circuit it is!
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6th Oct 2020 6:02pm |
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| discomog Member Since: 09 May 2015 Location: Notts/Lincs Border Posts: 2531 
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If you ordered a genuine LR switch you will not have to manufacture a bracket as there is an existing mounting hole on the opposite side of the bulkhead, the pin switch just clips in. Defender 90XS SW
Mini Countryman Cooper S Morgan Plus 8 |
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6th Oct 2020 6:25pm |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1081
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 So, same as for doors.
It IS confusing, though, when you open the normally closed bonnet, you close a normally closed switch by not pressing it to trigger the alarm...   |
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6th Oct 2020 7:09pm |
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| Andy RV Member Since: 26 Apr 2014 Location: Somewhere Posts: 66
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I’ve made the loom up and and it works perfectly, just need to sort the brackets out and it will be ready.
I presume the perfectly sized apertures beneath the headlights were originally designed for small headlight wipers? |
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10th Oct 2020 11:29am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17466 
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Nobody knows what those holes are for, the Defender headlight washers don't fit them. I suspect they were for something that never materialised.
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10th Oct 2020 12:32pm |
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