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phillips321



Member Since: 16 Dec 2021
Location: UK
Posts: 103
2005 Defender 110 2.5 TD DCPU Belize Green
TD5 switches, latching/nonlatching, telltale LED, Pins1-5?
Hi all,

At a breakers i've manage to find myself a load of TD5 switches from a disco2 that i wish to repurpose for kit in my defender TD5.

However im a little baffled by the variations in them.

First off some are latching, and some are non-latching (momentary). Can these switches be modified easily to change what type they are? Does anyone have any pics or videos on how to dismantle them?

Telltale LED, some switches have little LEDs in them, specifically the non-latching type.

Click image to enlarge

Im trying to use a multimeter to understand how these switches work so i can repurpose them but am struggling.

Click image to enlarge

Can anyone help with the following as this is what i have worked out so far...

Telltale LED switch:
Pin 1 + 4 connected when pressed
Pin 3 (telltale LED, connected with Pin1 when pressed, assume pin3 is ground? and positive to pin1?)
Pin 2?
Pin 5?

Latching switch:
Pin 1 + 4 connected when pressed
Pin 3 + 5 connected when pressed

Non-latching switch:
Pin 1 + 4 connected when pressed
Pin 3 + 5 always connected

So looking at the above it appears that 1+4 are the main switch pins, however the rest has got me stumped...
Post #955596 15th Jun 2022 2:48pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17458
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
All of these switches are essentially very similar and with a bit of imagination can be made to do most switching functions. They are fortunately very easy to dismantle.

The latching and non-latching button assemblies can be swapped, and if you look closely you will see that the switches all start start life exactly the same and are made to do the required function by means of holes drilled to cut specific tracks on the bit that looks like a circuit board. The LEDs differ, one is for switch illumination and the other if fitted is a tell-tale.

Standard configurations are latching and non-latching versions to switch power to an accessory or to switch ground to an accessory, with or without a tell-tale.

If you're handy with a soldering iron and tiny drill bits and like a logic puzzle the possibilities are extensive, and about the only thing you really cannot do is turn one into a double pole switch. Not long ago I turned an HDC switch into an illuminated SPDT with tell tale.

It is impossible to give any generic instructions since any mods depend on what you have to start with and what you want it to end up doing.
Post #955599 15th Jun 2022 3:51pm
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phillips321



Member Since: 16 Dec 2021
Location: UK
Posts: 103
2005 Defender 110 2.5 TD DCPU Belize Green
No wonder I was struggling to understand how these switches work, I didn't realise the holes drilled in the circuit board were in different places and in turn creating different circuits depending on the switch type! Very clever by landrover to create one switch for multiple applications!
Post #955600 15th Jun 2022 3:56pm
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phillips321



Member Since: 16 Dec 2021
Location: UK
Posts: 103
2005 Defender 110 2.5 TD DCPU Belize Green
blackwolf wrote:
versions to switch power to an accessory or to switch ground to an accessory


Also I don't really understand this difference, if the switch is in the circuit does switching power or switching ground just mean if it's before or after the accessory in the circuit?
Post #955601 15th Jun 2022 3:58pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17458
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It makes a big difference due to the tell-tale led.
Post #955606 15th Jun 2022 4:34pm
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ibexman



Member Since: 13 Dec 2008
Location: Essex
Posts: 2945
United Kingdom 
You need Paul Mc on here 👍 switch and wiring Guru
Post #955609 15th Jun 2022 5:10pm
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